Add bootable APT image for rk3399 SoC

The recipe creates the image for rockpro64 board bootable
with MMC or EMMC bootable devices.

New variable `sbc` (single-board computer) is introduced for selecting
the target device. This variable is needed for proper U-Boot files
selection and should have the same name as U-Boot directory targeting
to this device under `/usr/lib/u-boot/`:
 - firefly-rk3399
 - pinebook-pro-rk3399
 - puma-rk3399
 - rock-pi-4-rk3399
 - rock64-rk3328
 - rockpro64-rk3399

"rock-pi-4-rk3399" is used as a default target device.

Signed-off-by: Denis Pynkin <denis.pynkin@collabora.com>

image-rk3399.yaml

+{{ $architecture := or .architecture "arm64" }}
+{{ $type := or .type "minimal" }}
+{{ $suite := or .suite "v2022dev0" }}
+{{ $ospack := or .ospack (printf "ospack_%s-%s-%s" $suite $architecture $type) }}
+
+{{ $sbc := or .sbc "rock-pi-4-rk3399" }}
+{{ $cmdline := or .cmdline "rootwait rw verbose splash plymouth.ignore-serial-consoles fsck.mode=auto fsck.repair=yes earlyprintk earlycon=uart8250,mmio32,0xff1a0000 " }}
+
+{{ $image := or .image (printf "apertis-%s-%s-%s-%s" $suite $type $architecture $sbc) }}
+
+{{ $demopack := or .demopack "disabled" }}
+{{ if eq $type "minimal" }}
+{{ $demopack := "disabled" }}
+{{ end }}
+
+{{- $unpack := or .unpack "true" }}
+
+architecture: {{ $architecture }}
+
+actions:
+{{- if eq $unpack "true" }}
+  - action: unpack
+    description: Unpack {{ $ospack }}
+    compression: gz
+    file: {{ $ospack }}.tar.gz
+{{- end }}
+
+  - action: image-partition
+    imagename: {{ $image }}.img
+{{ if eq $type "minimal" }}
+    imagesize: 4G
+{{ else }}
+    imagesize: 15G
+{{ end }}
+    partitiontype: gpt
+
+    mountpoints:
+      - mountpoint: /
+        partition: system
+      - mountpoint: /boot
+        partition: boot
+      - mountpoint: /home
+        partition: general_storage
+
+    partitions:
+      - name: boot
+        fs: ext2
+        start: 32768s
+        end: 256M
+        flags: [ boot ]
+      - name: system
+        fs: ext4
+        start: 256M
+        end: 3000M
+      - name: general_storage
+        fs: ext4
+        start: 3000M
+        end: 100%
+
+  - action: filesystem-deploy
+    setup-kernel-cmdline: true
+    append-kernel-cmdline: {{ $cmdline }}
+    description: Deploying ospack onto image
+
+  - action: apt
+    description: U-Boot package
+    packages:
+      - u-boot-rockchip
+
+  - action: raw
+    description: Install loader1 for {{ $sbc }}
+    origin: filesystem
+    source: /usr/lib/u-boot/{{ $sbc }}/idbloader.img
+    offset: {{ sector 64 }}
+
+  - action: raw
+    description: Install U-Boot for {{ $sbc }}
+    origin: filesystem
+    source: /usr/lib/u-boot/{{ $sbc }}/u-boot.itb
+    offset: {{ sector 16384 }}
+
+  - action: overlay
+    description: Set the default bootcounter
+    source: overlays/default-uboot-bootcount
+
+  - action: overlay
+    description: "Enable USB automount"
+    source: overlays/usb-automount-rules
+
+  # Add multimedia demo pack
+  # Provide URL via '-t demopack:"https://images.apertis.org/media/multimedia-demo.tar.gz"'
+  # to add multimedia demo files
+  {{ if ne $demopack "disabled" }}
+  # Use wget to get some insight about https://phabricator.collabora.com/T11930
+  # TODO: Revert to a download action once the cause is found
+  - action: run
+    description: Download multimedia demo pack
+    chroot: false
+    command: wget --debug {{ $demopack }} -O "${ARTIFACTDIR}/multimedia-demo.tar.gz"
+
+  - action: unpack
+    description: Unpack multimedia demo pack
+    compression: gz
+    file: multimedia-demo.tar.gz
+
+  - action: run
+    description: Clean up multimedia demo pack tarball
+    chroot: false
+    command: rm "${ARTIFACTDIR}/multimedia-demo.tar.gz"
+  {{ end }}
+
+
+  # on arm64 the initramfs post-install does not call zz-u-boot-menu from
+  # u-boot-menupackage when it is installed at the same time as the kernel
+  # work around it by installing the the boot configuration tools first
+  # see https://phabricator.apertis.org/T6325
+  - action: apt
+    description: Boot configuration packages
+    packages:
+      - initramfs-tools
+      - u-boot-menu
+
+{{- if eq $architecture "armhf" }}
+  - action: overlay
+    source: overlays/initramfs-modules-armhf
+{{ end }}
+
+  - action: apt
+    description: Kernel and system packages
+    packages:
+      - kmod
+      - linux-base
+{{ if eq $architecture "armhf" }}
+      - linux-image-armmp
+{{ else }}
+      - linux-image-{{$architecture}}
+{{ end }}
+
+  - action: run
+    description: Switch to live APT repos
+    chroot: true
+    script: scripts/switch-apt-to-live.sh -r {{ $suite }}
+
+  - action: run
+    description: "Save installed package status"
+    chroot: false
+    command: gzip -c "${ROOTDIR}/var/lib/dpkg/status" > "${ARTIFACTDIR}/{{ $image }}.img.pkglist.gz"
+
+  - action: run
+    description: Cleanup /var/lib
+    script: scripts/remove_var_lib_parts.sh
+
+  # the clearing of machine-id can't be done before this point since
+  # systemd-boot requires the machine-id to be set for reasons related to
+  # dual-boot scenarios:
+  # * to avoid conflicts when creating entries, see the `90-loaderentry` kernel
+  #   install trigger
+  # * to set the entries for the currently booted installation as default in
+  #   the loader.conf generated by `bootctl install`
+  #
+  # in our image this is not useful, as the actual machine-id is supposed to be
+  # uniquely generated on the first boot. however the impact is negligible, as
+  # things still work albeit the code used to potentially disambiguate entries
+  # doesn't match a real machine-id
+  - action: run
+    chroot: false
+    description: "Empty /etc/machine-id so it's regenerated on first boot with an unique value"
+    command: truncate -s0 "${ROOTDIR}/etc/machine-id"
+
+  - action: run
+    description: Generate BOM file
+    chroot: false
+    script: scripts/generate_bom.py -d "${ROOTDIR}/usr/share/doc" -v 2 | gzip > "${ARTIFACTDIR}/{{ $image }}.img.licenses.gz"
+
+  - action: run
+    description: Delete /usr/share/doc
+    chroot: false
+    command: rm -rf "${ROOTDIR}"/usr/share/doc/*
+
+  - action: run
+    description: List files on {{ $image }}
+    chroot: false
+    script: scripts/list-files "$ROOTDIR" | gzip > "${ARTIFACTDIR}/{{ $image }}.img.filelist.gz"
+
+  - action: run
+    description: Create block map for {{ $image }}.img
+    postprocess: true
+    command: bmaptool create {{ $image }}.img > {{ $image }}.img.bmap
+
+  - action: run
+    description: Compress {{ $image }}.img
+    postprocess: true
+    command: gzip -f {{ $image }}.img
+
+  - action: run
+    description: Checksum for {{ $image }}.img.gz
+    postprocess: true
+    command: sha256sum {{ $image }}.img.gz > {{ $image }}.img.gz.sha256