fix libgui header location

Change-Id: Iec71706cdd4f29c6904993648ce873e83ef9cafe
diff --git a/libs/gui/ISurface.cpp b/libs/gui/ISurface.cpp
index 96155d7..c2ea183 100644
--- a/libs/gui/ISurface.cpp
+++ b/libs/gui/ISurface.cpp
@@ -22,8 +22,8 @@
 
 #include <binder/Parcel.h>
 
+#include <gui/ISurface.h>
 #include <gui/ISurfaceTexture.h>
-#include <surfaceflinger/ISurface.h>
 
 namespace android {