fip: mk: bypass to check bl31.bin for openlinux case [1/1]

PD#SWPL-20699

Problem:
Current building script could generate u-boot.bin even without
right bl2.bin, which makes the result confusing.

Solution:
adding check blx firmware for bootloader building script

Verify:
Compiling pass for G12A, C1

Change-Id: I0a3d5a82d2099500ba1a2f7f3d1066f8c2905062
Signed-off-by: Honglin Zhang <honglin.zhang@amlogic.com>
diff --git a/mk_script.sh b/mk_script.sh
index 3f6eb90..20a3e4a 100755
--- a/mk_script.sh
+++ b/mk_script.sh
@@ -154,6 +154,7 @@
 		if [ "y" != "${check_bypass}" ]; then
 			if [ "NULL" != "${BLX_BIN_NAME[$loop]}" ] && \
 			   [ -n "${BLX_BIN_NAME[$loop]}" ] && \
+			   [ "NULL" == "${BLX_IMG_NAME[$loop]}" ] && \
 			   [ ! -f ${FIP_BUILD_FOLDER}/${BLX_BIN_NAME[$loop]} ]; then
 				echo "Error ${BLX_NAME[$loop]}: ${FIP_BUILD_FOLDER}/${BLX_BIN_NAME[$loop]} doesn't exit... abort"
 				exit -1