SurfaceFlinger: Move GraphicBufferAlloc to libgui

This change moves the GraphicBufferAlloc class from SurfaceFlinger to libgui.

Change-Id: Idf31d2004efa2651b60590733f73c4a7b831e8a9
diff --git a/services/surfaceflinger/DisplayHardware/FramebufferSurface.cpp b/services/surfaceflinger/DisplayHardware/FramebufferSurface.cpp
index 6c86a53..cccb29b 100644
--- a/services/surfaceflinger/DisplayHardware/FramebufferSurface.cpp
+++ b/services/surfaceflinger/DisplayHardware/FramebufferSurface.cpp
@@ -30,10 +30,10 @@
 
 #include <hardware/hardware.h>
 #include <gui/SurfaceTextureClient.h>
+#include <gui/GraphicBufferAlloc.h>
 #include <ui/GraphicBuffer.h>
 
 #include "DisplayHardware/FramebufferSurface.h"
-#include "DisplayHardware/GraphicBufferAlloc.h"
 #include "DisplayHardware/HWComposer.h"
 
 #ifndef NUM_FRAMEBUFFER_SURFACE_BUFFERS