libmix: reset mRotationDegree when setupVA

BZ: 180000

Need to reset mRotationDegree when setupVA to make sure
to pass latest rotation info to driver part

Change-Id: I36ed1d957e8a230f008dcc9033e51ecdecf9571f
Signed-off-by: Nana GUo <nana.n.guo@intel.com>
diff --git a/videodecoder/VideoDecoderBase.cpp b/videodecoder/VideoDecoderBase.cpp
index a1e3866..bf2a46e 100644
--- a/videodecoder/VideoDecoderBase.cpp
+++ b/videodecoder/VideoDecoderBase.cpp
@@ -736,6 +736,7 @@
         return DECODE_SUCCESS;
     }
 
+    mRotationDegrees = 0;
     if (mConfigBuffer.flag & USE_NATIVE_GRAPHIC_BUFFER){
 #ifdef TARGET_HAS_VPP
         if (mVideoFormatInfo.actualBufferNeeded > mConfigBuffer.surfaceNumber - mConfigBuffer.vppBufferNum)