hwc: Cleanup patch for SideSync and WFD/HDMI downscale feature

    Move block of code corresponds to SideSync and WFD/HDMI downscale
    feature to a seperate function.

Change-Id: Ib07cec61abf3a7226bc4dd2ebb9f313519114fd4
diff --git a/libhwcomposer/hwc_fbupdate.h b/libhwcomposer/hwc_fbupdate.h
index 55cd655..3c76efe 100644
--- a/libhwcomposer/hwc_fbupdate.h
+++ b/libhwcomposer/hwc_fbupdate.h
@@ -66,6 +66,11 @@
 private:
     bool configure(hwc_context_t *ctx, hwc_display_contents_1 *list,
             int fbZorder);
+    bool preRotateExtDisplay(hwc_context_t *ctx,
+                                 ovutils::Whf &info,
+                                 hwc_rect_t& sourceCrop,
+                                 ovutils::eMdpFlags& mdpFlags,
+                                 int& rotFlags);
     ovutils::eDest mDest; //pipe to draw on
 };