hwc: Enable swapRect for multiple updating layers use cases

In current code swapRect optimization is enabled for the use cases,
where only one layer is updating. this change will enable swapRect for
use cases where more than one layer is updating.

Change-Id: I902ecaa4ab53eac1115d5ea40c9cd582f639bfd8
diff --git a/libqdutils/cb_utils.h b/libqdutils/cb_utils.h
index a383fb0..55225b6 100644
--- a/libqdutils/cb_utils.h
+++ b/libqdutils/cb_utils.h
@@ -38,7 +38,7 @@
 class CBUtils {
 public:
     static int uiClearRegion(hwc_display_contents_1_t* list,
-            int version, LayerProp *layerProp, int dirtyIndex,
+            int version, LayerProp *layerProp, hwc_rect_t dirtyIndex,
             copybit_device_t *copybit, private_handle_t *renderBuffer);
 };
 }//namespace qdutils