mdssRotator:For Venus, rotator buffer size depends on rotated w/h

Due to alignment requirements on venus format, rotator buffer size
calculation needs to be performed according to destination buffer
dimensions. Due to these alignments, the buffer can be different
when width and height are swapped due to 90 degree rotation.

Change-Id: I8eb0f1ece22946e6c3b2106623c3457e6871fd9c
diff --git a/liboverlay/overlayRotator.h b/liboverlay/overlayRotator.h
index 4ef33f3..ca71402 100644
--- a/liboverlay/overlayRotator.h
+++ b/liboverlay/overlayRotator.h
@@ -199,6 +199,7 @@
     void doTransform();
     /* reset underlying data, basically memset 0 */
     void reset();
+    void setBufSize(int format);
 
     /* MdssRot info structure */
     mdp_overlay   mRotInfo;