build: support --use_prebuilt_gki [1/1]

PD#SWPL-130219

Problem:
support --use_prebuilt_gki

Solution:
support --use_prebuilt_gki

Verify:
local

Change-Id: I32515737f5663b798f23ee2c69ce4b766ee1c5e6
Signed-off-by: Wanwei Jiang <wanwei.jiang@amlogic.com>
diff --git a/amlogic_utils.sh b/amlogic_utils.sh
index b7091dd..86cee1e 100644
--- a/amlogic_utils.sh
+++ b/amlogic_utils.sh
@@ -1236,12 +1236,12 @@
 function export_env_variable () {
 	export ABI BUILD_CONFIG LTO KMI_SYMBOL_LIST_STRICT_MODE CHECK_DEFCONFIG MANUAL_INSMOD_MODULE ARCH
 	export KERNEL_DIR COMMON_DRIVERS_DIR BUILD_DIR ANDROID_PROJECT GKI_CONFIG UPGRADE_PROJECT ANDROID_VERSION FAST_BUILD CHECK_GKI_20 DEV_CONFIGS
-	export FULL_KERNEL_VERSION BAZEL
+	export FULL_KERNEL_VERSION BAZEL PREBUILT_GKI
 
 	echo ROOT_DIR=$ROOT_DIR
 	echo ABI=${ABI} BUILD_CONFIG=${BUILD_CONFIG} LTO=${LTO} KMI_SYMBOL_LIST_STRICT_MODE=${KMI_SYMBOL_LIST_STRICT_MODE} CHECK_DEFCONFIG=${CHECK_DEFCONFIG} MANUAL_INSMOD_MODULE=${MANUAL_INSMOD_MODULE}
 	echo KERNEL_DIR=${KERNEL_DIR} COMMON_DRIVERS_DIR=${COMMON_DRIVERS_DIR} BUILD_DIR=${BUILD_DIR} ANDROID_PROJECT=${ANDROID_PROJECT} GKI_CONFIG=${GKI_CONFIG} UPGRADE_PROJECT=${UPGRADE_PROJECT} ANDROID_VERSION=${ANDROID_VERSION}  FAST_BUILD=${FAST_BUILD} CHECK_GKI_20=${CHECK_GKI_20}
-	echo FULL_KERNEL_VERSION=${FULL_KERNEL_VERSION} BAZEL=${BAZEL}
+	echo FULL_KERNEL_VERSION=${FULL_KERNEL_VERSION} BAZEL=${BAZEL} PREBUILT_GKI=${PREBUILT_GKI}
 	echo MENUCONFIG=${MENUCONFIG} BASICCONFIG=${BASICCONFIG} IMAGE=${IMAGE} MODULES=${MODULES} DTB_BUILD=${DTB_BUILD}
 }
 export -f export_env_variable
@@ -1357,8 +1357,9 @@
 			VA=1
 			shift
 			;;
-		--bazel)
-			BAZEL=1
+		--use_prebuilt_gki)
+			PREBUILT_GKI=$2
+			VA=1
 			shift
 			;;
 		-h|--help)