Change mLastTimeStamp in flush to fix testVP9Adaptive test in gts am: 7c95319679
am: 8341acda01

Change-Id: I0a73cd67d30813a5af74d813f05e43cdb91d6b67
diff --git a/videocodec/OMXVideoDecoderVP9Hybrid.cpp b/videocodec/OMXVideoDecoderVP9Hybrid.cpp
index 20075ab..53dbd48 100644
--- a/videocodec/OMXVideoDecoderVP9Hybrid.cpp
+++ b/videocodec/OMXVideoDecoderVP9Hybrid.cpp
@@ -251,7 +251,6 @@
         unsigned int width, height;
         mDecoderDecode(mCtx,mHybridCtx,NULL,0,true);
         mGetOutput(mCtx,mHybridCtx, &width, &height);
-        mLastTimeStamp = 0;
     }
     return OMX_ErrorNone;
 }