bl33: add kernel-version build parameter [2/2]

PD#SWPL-193657

Problem:
Unable to display on T7C R trunk firmware
due to bl33 2019 incompatibility with kernel 5.4.

Solution:
Add a flag during compilation to specify
if the kernel is 5.4.

Verify:
t7c

Change-Id: I622b989fece6aa7ddbea675afecb069fee8c5bb8
Signed-off-by: Cheng Wang2 <cheng.wang2@amlogic.com>
diff --git a/mk_script.sh b/mk_script.sh
index caa42f7..bbb5f43 100755
--- a/mk_script.sh
+++ b/mk_script.sh
@@ -284,6 +284,10 @@
 		echo "export BOARD_COMPILE_HDMITX_ONLY=null"
 		export BOARD_COMPILE_HDMITX_ONLY=null
 	fi
+	if [ ! $BOARD_KERNEL_VERSION]; then
+		echo "export BOARD_KERNEL_VERSION=null"
+		export BOARD_KERNEL_VERSION=null
+	fi
 	if [ ! $BOARD_DISPLAY_PIPELINE ]; then
 		echo "export BOARD_DISPLAY_PIPELINE=null"
 		export BOARD_DISPLAY_PIPELINE=null
@@ -534,6 +538,10 @@
 				export BOARD_DISPLAY_PIPELINE="${argv[$i]}"
 				echo "export BOARD_DISPLAY_PIPELINE="${argv[$i]}""
 				continue ;;
+			--kernel-version)
+				export BOARD_KERNEL_VERSION="${argv[$i]}"
+				echo "export BOARD_KERNEL_VERSION="${argv[$i]}""
+				continue ;;
 			--ipc-ddr-size)
 				CONFIG_IPC_DDR_SIZE="${argv[$i]}"
 				export CONFIG_IPC_DDR_SIZE