kas: Include unattended Debian test

Add unattended installation yml to Debian  target

Signed-off-by: Musa Antike <musa.antike@arm.com>
Signed-off-by: Jon Mason <jon.mason@arm.com>

kas/arm-systemready-linux-distros-debian.yml

@@ -2,6 +2,7 @@ header:
   version: 13
   includes:
     - kas/arm-systemready-firmware.yml
+    - kas/arm-systemready-linux-distros-unattended-installation.yml
 
 target:
   - arm-systemready-linux-distros-debian