Change first stage image for RPi4

Running LAVA tests shows random failures on some boards, causing several
tests to fail. After investigating it, this is most likely to happen
when using v2021 as first stage image to flash the device.

Since the v2022 is the first release which properly supports RPi4 switch
to it as first stage release.

Signed-off-by: Walter Lozano <walter.lozano@collabora.com>

lava/devices.yaml

@@ -38,7 +38,7 @@ device-arm64-bcm2711-rpi-4-b:
         - boot
       device_type: bcm2711-rpi-4-b
       firststagedtb: broadcom/bcm2711-rpi-4-b.dtb
-      firststageurl: "https://images.apertis.org/release/v2021/v2021.0" # Use a more recent image: there is no support for rpi-4-b in v2019.1
+      firststageurl: "https://images.apertis.org/release/v2022/v2022.0" # Use a more recent image: there is no support for rpi-4-b in v2019.1
       dtb: broadcom/bcm2711-rpi-4-b.dtb
       needs_dtb: true
 device-amd64-qemu: