Get AID_GRAPHICS from right place

Change-Id: I97b1754dc7260fec083275c71a8f71ebfb2cefa8
diff --git a/services/surfaceflinger/SurfaceFlinger.cpp b/services/surfaceflinger/SurfaceFlinger.cpp
index 42ae408..af47402 100644
--- a/services/surfaceflinger/SurfaceFlinger.cpp
+++ b/services/surfaceflinger/SurfaceFlinger.cpp
@@ -59,15 +59,9 @@
 #include "DisplayHardware/DisplayHardware.h"
 #include "DisplayHardware/HWComposer.h"
 
+#include <private/android_filesystem_config.h>
 #include <private/surfaceflinger/SharedBufferStack.h>
 
-/* ideally AID_GRAPHICS would be in a semi-public header
- * or there would be a way to map a user/group name to its id
- */
-#ifndef AID_GRAPHICS
-#define AID_GRAPHICS 1003
-#endif
-
 #define EGL_VERSION_HW_ANDROID  0x3143
 
 #define DISPLAY_COUNT       1