mm-drivers: msm_ext_display: export msm-ext-display module symbols

msm_ext_display module symbols have to be exported before they can be
used by external kernel modules. This change updates the makefile 
for the same.

Change-Id: I86dbc2d8bbc0a3a0d640172ef0aebc03723eecc8
Signed-off-by: Sandeep Gangadharaiah <[email protected]>

msm_ext_display/Android.mk

@@ -18,6 +18,16 @@ KBUILD_OPTIONS := MSM_EXT_DISPLAY_ROOT=$(MSM_EXT_DISPLAY_BLD_DIR)
 KBUILD_OPTIONS += MODNAME=msm_ext_display
 KBUILD_OPTIONS += BOARD_PLATFORM=$(TARGET_BOARD_PLATFORM)
 
+###########################################################
+include $(CLEAR_VARS)
+# For incremental compilation
+LOCAL_SRC_FILES           := $(wildcard $(LOCAL_PATH)/**/*) $(wildcard $(LOCAL_PATH)/*)
+LOCAL_MODULE              := msm-ext-disp-module-symvers
+LOCAL_MODULE_STEM         := Module.symvers
+LOCAL_MODULE_KBUILD_NAME  := Module.symvers
+LOCAL_MODULE_PATH         := $(KERNEL_MODULES_OUT)
+
+include $(DLKM_DIR)/Build_external_kernelmodule.mk
 ###########################################################
 include $(CLEAR_VARS)
 LOCAL_SRC_FILES   := $(wildcard $(LOCAL_PATH)/**/*) $(wildcard $(LOCAL_PATH)/*)