disp: add changes to generate display dlkm in android

Add Android make files and Kbuild files to support dlkm
for display driver. Also resolve header and config issues
to allow successful compilation of display driver.

Change-Id: I04d6233864ea54c0a808b295fbdccb83058f1fd2
Signed-off-by: Samantha Tran <samtran@codeaurora.org>
Signed-off-by: Chandan Uddaraju <chandanu@codeaurora.org>
Signed-off-by: Prabhanjan Kandula <pkandula@codeaurora.org>

include/uapi/display/Android.mk

@@ -0,0 +1,25 @@
+LOCAL_PATH := $(call my-dir)
+MYLOCAL_PATH := $(LOCAL_PATH)
+
+UAPI_OUT := $(PRODUCT_OUT)/obj/vendor/qcom/opensource/display-drivers/include/display
+
+DISPLAY_DRIVER_HEADERS := $(call all-named-files-under,*.h,drm) $(call all-named-files-under,*.h,media)
+
+HEADER_INSTALL_DIR := kernel/msm-$(TARGET_KERNEL_VERSION)/scripts
+
+BUILD_ROOT_RELATIVE := ../../../../../../
+
+include $(CLEAR_VARS)
+LOCAL_MODULE                  := display_driver_headers
+
+GEN := $(addprefix $(UAPI_OUT)/,$(DISPLAY_DRIVER_HEADERS))
+$(GEN): $(KERNEL_USR)
+$(GEN): PRIVATE_PATH := $(MYLOCAL_PATH)
+$(GEN): PRIVATE_CUSTOM_TOOL = $(shell cd $(PRODUCT_OUT)/obj/KERNEL_OBJ; $(BUILD_ROOT_RELATIVE)$(HEADER_INSTALL_DIR)/headers_install.sh $(BUILD_ROOT_RELATIVE)$(dir $@) $(BUILD_ROOT_RELATIVE)$(subst $(UAPI_OUT),$(MYLOCAL_PATH),$(dir $@)) $(notdir $@))
+$(GEN): $(addprefix $(MYLOCAL_PATH)/,$(DISPLAY_DRIVER_HEADERS))
+	$(transform-generated-source)
+
+LOCAL_GENERATED_SOURCES := $(GEN)
+LOCAL_EXPORT_C_INCLUDE_DIRS := $(UAPI_OUT)
+
+include $(BUILD_HEADER_LIBRARY)