Make vr.$TARGET_BOARD_PLATFORM build with the VNDK.
am: 7940454756

Change-Id: I840b6a48df00d511aadf9b99a5c617130c0a0087
diff --git a/Android.mk b/Android.mk
index 99df099..6e43edd 100644
--- a/Android.mk
+++ b/Android.mk
@@ -30,6 +30,7 @@
 LOCAL_SRC_FILES += vr-845.c
 endif
 
+LOCAL_HEADER_LIBRARIES := libhardware_headers
 LOCAL_SHARED_LIBRARIES := liblog libcutils
 LOCAL_MODULE_TAGS := optional
 LOCAL_CFLAGS += -Wno-unused-parameter