overlay: mdssRot: Fix stale rotation flag values.

When moving from a non-zero to 0 orientation rot flags are not cleared.
This change resets the flag to 0 after every commit.

Change-Id: I2fb9759921c36620c53bf2ac92d9473a42919d8c

liboverlay/overlayMdssRot.cpp

@@ -1,6 +1,6 @@
 /*
  * Copyright (C) 2008 The Android Open Source Project
- * Copyright (c) 2010-2012, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2010-2013, The Linux Foundation. All rights reserved.
  * Not a Contribution, Apache license notifications and license are retained
  * for attribution purposes only.
  *
@@ -132,6 +132,8 @@ bool MdssRot::commit() {
         return false;
     }
     mRotData.id = mRotInfo.id;
+    //reset flags to avoid stale orientation values
+    mRotInfo.flags = 0;
     return true;
 }