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/libhwcomposer/hwc_qclient.cpp b/libhwcomposer/hwc_qclient.cpp
index edf579f..65667bd 100644
--- a/libhwcomposer/hwc_qclient.cpp
+++ b/libhwcomposer/hwc_qclient.cpp
@@ -107,4 +107,9 @@
 #endif
     return result;
 }
+
+void QClient::setExtOrientation(uint32_t orientation) {
+    mHwcContext->mExtOrientation = orientation;
+}
+
 }