get rid of GraphicPlane

its functionality is now folded into DisplayHardware
there will be more changes in that area.
diff --git a/services/surfaceflinger/EventThread.h b/services/surfaceflinger/EventThread.h
index b42cab6..04c8f53 100644
--- a/services/surfaceflinger/EventThread.h
+++ b/services/surfaceflinger/EventThread.h
@@ -27,7 +27,7 @@
 #include <utils/threads.h>
 #include <utils/SortedVector.h>
 
-#include "DisplayHardware/DisplayHardware.h"
+#include "DisplayHardware.h"
 
 // ---------------------------------------------------------------------------