Add u-boot-tools package

Add u-boot-tools package to have utilities for managing u-boot
environment from command line in userspace.

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

apertis-image-mx6qsabrelite.yaml

@@ -92,6 +92,7 @@ actions:
       - linux-image-armmp
       - u-boot-imx
       - u-boot-common
+      - u-boot-tools
       - btrfs-tools
 
   - action: raw

apertis-ostree-commit.yaml

@@ -30,6 +30,7 @@ actions:
     {{- end }}
     {{- if eq $architecture "armhf" }}
       - u-boot-imx
+      - u-boot-tools
     {{- end }}
 
   - action: apt