techpack-video: Variant build support

Added binary artifacts support for variant build

Change-Id: I3ec23c80bc7d5be2222d44c6e7200136dcab6e42
Signed-off-by: Karthikeyan Periasamy <[email protected]>

video_kernel_board.mk

@@ -3,5 +3,7 @@
 ifneq ($(TARGET_BOARD_AUTO),true)
 ifeq ($(call is-board-platform-in-list,$(TARGET_BOARD_PLATFORM)),true)
 BOARD_VENDOR_KERNEL_MODULES += $(KERNEL_MODULES_OUT)/msm_video.ko
+
+BUILD_VIDEO_TECHPACK_SOURCE := true
 endif
 endif