displayconfig: Export header's path.

Change-Id: Ieb8e18c68e1c1bb51698dadd81cc0a8f02721335
diff --git a/libdisplayconfig/Android.mk b/libdisplayconfig/Android.mk
index 9f84c61..ec9340d 100644
--- a/libdisplayconfig/Android.mk
+++ b/libdisplayconfig/Android.mk
@@ -7,6 +7,7 @@
 LOCAL_SRC_FILES               := DisplayConfig.cpp
 LOCAL_SHARED_LIBRARIES        := libhidlbase libhidltransport libutils \
                                  vendor.display.config@1.0
+LOCAL_EXPORT_C_INCLUDE_DIRS   := $(LOCAL_PATH)
 
 ifeq ($(LLVM_SA), true)
     LOCAL_CFLAGS += --compile-and-analyze --analyzer-perf --analyzer-Werror