display: Add support orientation control on ext display

- The required orientation on External can be set using the
  properyt sys.ext_orientation.
- Values can be HAL_TRANSFORM_ROT_90, HAL_TRANSFORM_ROT_270
- According to the value set, the FB_TARGET for External will
  be rotated and positioned as per aspect ratio on Ext
- For YUV(video layer) it just calculates the position, as the
  rotation should be the source orientation
- This feature is supported only for low resolution panel.

Change-Id: I3d532ee0cb8dca3c37869537b55cd8044fd9047e
diff --git a/libqservice/QService.h b/libqservice/QService.h
index 268bf81..8eefa21 100644
--- a/libqservice/QService.h
+++ b/libqservice/QService.h
@@ -49,6 +49,7 @@
     virtual void unsecuring(uint32_t startEnd);
     virtual void connect(const android::sp<qClient::IQClient>& client);
     virtual android::status_t screenRefresh();
+    virtual void setExtOrientation(uint32_t orientation);
     static void init();
 private:
     QService();