imx6: Re-add mmc aliases

In commit d0399a46e7cda63c07e3eb8558bef84cfb068028, the device tree was synchronized from linux and the aliases were dropped.

They need to be kept so that the mmc cards are in the right order. Without the aliases, u-boot reports: MMC: FSL_SDHC: 2, FSL_SDHC: 3

With the aliases, u-boot reports: MMC: FSL_SDHC: 0, FSL_SDHC: 1

The upstream linux device tree does not contain the same aliases than u-boot (It keeps the devices order with /dev/mmcblk2 and /dev/mmcblk3). Because this board has been using different aliases in u-boot and linux, a imx6q-sabrelite-u-boot.dtsi file is added to be automatically included in imx6q-sabrelite.dts.

This way, linux and u-boot each keep their own aliases and there is no breakage and current installations.

This should never be done for new boards as we want to keep linux and u-boot with the same aliases as much as possible. This patch is only necessary to avoid breaking existing setups.

https://phabricator.apertis.org/T9333

debian/patches/apertis/am62x/0054-Remove-openssl-check.patch

+From: Martyn Welch <martyn.welch@collabora.com>
+Date: Wed, 16 Nov 2022 12:14:53 +0000
+Subject: Remove openssl check
+
+The k3 arch code performs a check to see if the openssl command is
+available as it is used to sign firmware blobs. We are not assembling or
+signing the firmware blobs until a later stage, so we don't need openssl
+installed at this point.
+
+Signed-off-by: Martyn Welch <martyn.welch@collabora.com>
+---
+ arch/arm/mach-k3/config.mk | 6 +++---
+ 1 file changed, 3 insertions(+), 3 deletions(-)
+
+diff --git a/arch/arm/mach-k3/config.mk b/arch/arm/mach-k3/config.mk
+index 9306f26..f1c9991 100644
+--- a/arch/arm/mach-k3/config.mk
++++ b/arch/arm/mach-k3/config.mk
+@@ -7,9 +7,9 @@ ifdef CONFIG_SPL_BUILD
+ 
+ # Openssl is required to generate x509 certificate.
+ # Error out if openssl is not available.
+-ifeq ($(shell which openssl),)
+-$(error "No openssl in $(PATH), consider installing openssl")
+-endif
++#ifeq ($(shell which openssl),)
++#$(error "No openssl in $(PATH), consider installing openssl")
++#endif
+ 
+ IMAGE_SIZE= $(shell cat $(obj)/u-boot-spl.bin | wc -c)
+ MAX_SIZE= $(shell printf "%d" $(CONFIG_SYS_K3_MAX_DOWNLODABLE_IMAGE_SIZE))