msm-vidc: Enable standalone compilation for video

Added support for compiling video as kernel loadable module.

Change-Id: I5b9183d56d14e5e413b786b9ac2b449c6f8ab8ba
Signed-off-by: Karthikeyan Periasamy <kperiasa@codeaurora.org>

Android.mk

@@ -0,0 +1,32 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+VIDEO_BLD_DIR := $(shell pwd)/vendor/qcom/opensource/video-driver
+VIDEO_SELECT := CONFIG_MSM_VIDC_V4L2=m
+
+# Build msm_video.ko
+###########################################################
+# This is set once per LOCAL_PATH, not per (kernel) module
+KBUILD_OPTIONS := VIDEO_ROOT=$(VIDEO_BLD_DIR)
+
+KBUILD_OPTIONS += MODNAME=msm_video
+KBUILD_OPTIONS += BOARD_PLATFORM=$(TARGET_BOARD_PLATFORM)
+KBUILD_OPTIONS += $(VIDEO_SELECT)
+
+###########################################################
+
+DLKM_DIR   := device/qcom/common/dlkm
+
+LOCAL_PATH := $(call my-dir)
+
+include $(CLEAR_VARS)
+# For incremental compilation
+LOCAL_SRC_FILES           := $(wildcard $(LOCAL_PATH)/**/*) $(wildcard $(LOCAL_PATH)/*)
+LOCAL_MODULE              := msm_video.ko
+LOCAL_MODULE_KBUILD_NAME  := msm_video.ko
+LOCAL_MODULE_TAGS         := optional
+LOCAL_MODULE_DEBUG_ENABLE := true
+LOCAL_MODULE_PATH         := $(KERNEL_MODULES_OUT)
+
+# Include kp_module.ko in the /vendor/lib/modules (vendor.img)
+# BOARD_VENDOR_KERNEL_MODULES += $(LOCAL_MODULE_PATH)/$(LOCAL_MODULE)
+include $(DLKM_DIR)/Build_external_kernelmodule.mk