gralloc: fix dependencies

Test: works with BOARD_VNDK_VERSION := current
Bug: 33241851
Change-Id: I145488dbf9b6e5257bee47920643c03c31eafbf4
diff --git a/modules/gralloc/Android.mk b/modules/gralloc/Android.mk
index cdd8d07..ff5808d 100644
--- a/modules/gralloc/Android.mk
+++ b/modules/gralloc/Android.mk
@@ -28,6 +28,8 @@
 	framebuffer.cpp \
 	mapper.cpp
 
+LOCAL_HEADER_LIBRARIES := libhardware_headers
+
 LOCAL_MODULE := gralloc.default
 LOCAL_CFLAGS:= -DLOG_TAG=\"gralloc\" -Wno-missing-field-initializers
 ifeq ($(TARGET_USE_PAN_DISPLAY),true)