Fix gapless for deep buffers

Forward current flags to next output.
b/6645676

Change-Id: I584f7a67472d99cbd6bc38f3fe84763331d115d1
diff --git a/media/libmediaplayerservice/MediaPlayerService.cpp b/media/libmediaplayerservice/MediaPlayerService.cpp
index 4bf2d3f..c47fbd6 100644
--- a/media/libmediaplayerservice/MediaPlayerService.cpp
+++ b/media/libmediaplayerservice/MediaPlayerService.cpp
@@ -1679,6 +1679,7 @@
         mNextOutput->mSampleRateHz = mSampleRateHz;
         mNextOutput->mMsecsPerFrame = mMsecsPerFrame;
         mNextOutput->mBytesWritten = mBytesWritten;
+        mNextOutput->mFlags = mFlags;
     }
 }