imx8ulp: Add A1 part image build

Add "REV=A1" to build option to select A1 Sentinel container image
For example: make SOC=iMX8ULP REV=A1 flash_singleboot_m33

Signed-off-by: Ye Li <ye.li@nxp.com>

iMX8ULP/soc.mak

@@ -18,7 +18,8 @@ else
     RENAME = rename
 endif
 
-AHAB_IMG = mx8ulpa0-ahab-container.img
+LC_REVISION = $(shell echo $(REV) | tr ABC abc)
+AHAB_IMG = mx8ulp$(LC_REVISION)-ahab-container.img
 UPOWER_IMG = upower.bin
 MCU_IMG = m33_image.bin