DM: add param: -V 5 to auto check/boot UOS image

it can auto check android image, if exists, then launch it;
if not, it will try to luanch clearlinux. it can be used by
acrn_guest.service to auto boot UOS.

Signed-off-by: Minggui Cao <minggui.cao@intel.com>
Reviewed-by: Binbin Wu <binbin.wu@intel.com>

Author: mgcao

devicemodel/samples/apl-mrb/launch_uos.sh

@@ -306,6 +306,7 @@ echo "-V 1 means just launching 1 clearlinux UOS"
 echo "-V 2 means just launching 1 android UOS"
 echo "-V 3 means launching 1 clearlinux UOS + 1 android UOS"
 echo "-V 4 means launching 2 clearlinux UOSs"
+echo "-V 5 means auto check android/linux UOS; if exist, launch it"
 }
 
 launch_type=1
@@ -332,6 +333,14 @@ done
 mkdir -p /data
 mount /dev/mmcblk1p3 /data
 
+if [ $launch_type == 5 ]; then
+	if [ -f "/data/android/android.img" ]; then
+	  launch_type=2;
+	else
+	  launch_type=1;  
+	fi
+fi
+
 # make sure there is enough 2M hugepages in the pool
 echo 1024 > /sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages