msm: camera: common: Update Android.mk for incremental compile support

Adds LOCAL_SRC_FILES tracking list to Android.mk to enable support for
incremental compilation.

CRs-Fixed: 2835738
Change-Id: I5f4c5f5f73485e1fe1dd54483ef263129b557386
Signed-off-by: Karthik Jayakumar <kjayakum@codeaurora.org>

Android.mk

@@ -15,6 +15,8 @@ KBUILD_OPTIONS += BOARD_PLATFORM=$(TARGET_BOARD_PLATFORM)
 
 # Clear shell environment variables from previous android module during build
 include $(CLEAR_VARS)
+# For incremental compilation support.
+LOCAL_SRC_FILES             := $(wildcard $(LOCAL_PATH)/**/*) $(wildcard $(LOCAL_PATH)/*)
 LOCAL_MODULE_PATH           := $(KERNEL_MODULES_OUT)
 LOCAL_MODULE                := camera.ko
 LOCAL_MODULE_TAGS           := optional