sm8450-common: Include system_ext in vbmeta system

Change-Id: If8deff26f3f1420c37041c6f5ba7a2f49cdeb4ce

BoardConfigCommon.mk

@@ -87,7 +87,7 @@ BOARD_AVB_RECOVERY_KEY_PATH := external/avb/test/data/testkey_rsa2048.pem
 BOARD_AVB_RECOVERY_ALGORITHM := SHA256_RSA2048
 BOARD_AVB_RECOVERY_ROLLBACK_INDEX := $(PLATFORM_SECURITY_PATCH_TIMESTAMP)
 BOARD_AVB_RECOVERY_ROLLBACK_INDEX_LOCATION := 1
-BOARD_AVB_VBMETA_SYSTEM := system product
+BOARD_AVB_VBMETA_SYSTEM := system system_ext product
 BOARD_AVB_VBMETA_SYSTEM_KEY_PATH := external/avb/test/data/testkey_rsa2048.pem
 BOARD_AVB_VBMETA_SYSTEM_ALGORITHM := SHA256_RSA2048
 BOARD_AVB_VBMETA_SYSTEM_ROLLBACK_INDEX := $(PLATFORM_SECURITY_PATCH_TIMESTAMP)