Hardware overlay support

Enable hardware overlay support for camera and video playback use cases
diff --git a/include/ui/Overlay.h b/include/ui/Overlay.h
index 9ba2f7b..acc9bea 100644
--- a/include/ui/Overlay.h
+++ b/include/ui/Overlay.h
@@ -82,6 +82,10 @@
     /* release the overlay buffer and post it */
     status_t queueBuffer(overlay_buffer_t buffer);
 
+    status_t setCrop(uint32_t x, uint32_t y, uint32_t w, uint32_t h) ;
+
+    status_t getCrop(uint32_t* x, uint32_t* y, uint32_t* w, uint32_t* h) ;
+
     /* returns the address of a given buffer if supported, NULL otherwise. */
     void* getBufferAddress(overlay_buffer_t buffer);