libgralloc: Export header files - alloc_controller.h, memalloc.h

- Export header files alloc_controller.h, memalloc.h, gr.h to
    TARGET_OUT path

Change-Id: Ie8f3136eddd9c29ca5210e6d3122b22dada9face
diff --git a/libgralloc/Android.mk b/libgralloc/Android.mk
index a879c5c..ef10f54 100644
--- a/libgralloc/Android.mk
+++ b/libgralloc/Android.mk
@@ -27,7 +27,7 @@
 LOCAL_ADDITIONAL_DEPENDENCIES := $(common_deps) $(kernel_deps)
 LOCAL_SRC_FILES               := gpu.cpp gralloc.cpp framebuffer.cpp mapper.cpp
 LOCAL_COPY_HEADERS_TO         := $(common_header_export_path)
-LOCAL_COPY_HEADERS            := gralloc_priv.h
+LOCAL_COPY_HEADERS            := gralloc_priv.h gr.h
 
 include $(BUILD_SHARED_LIBRARY)
 
@@ -41,5 +41,6 @@
 LOCAL_CFLAGS                  := $(common_flags) -DLOG_TAG=\"qdmemalloc\"
 LOCAL_ADDITIONAL_DEPENDENCIES := $(common_deps) $(kernel_deps)
 LOCAL_SRC_FILES               := ionalloc.cpp alloc_controller.cpp
+LOCAL_COPY_HEADERS            := alloc_controller.h memalloc.h
 
 include $(BUILD_SHARED_LIBRARY)