MediaPlayer2: seekTo does not change state.

Test: MediaPlayer2 plays
Bug: 63934228
Change-Id: I13ec7225277b2f53535274828eb9d06ccd77db0c
diff --git a/media/libmediaplayer2/nuplayer2/NuPlayer2.h b/media/libmediaplayer2/nuplayer2/NuPlayer2.h
index e884b92..e7b774c 100644
--- a/media/libmediaplayer2/nuplayer2/NuPlayer2.h
+++ b/media/libmediaplayer2/nuplayer2/NuPlayer2.h
@@ -293,9 +293,7 @@
     void handleFlushComplete(bool audio, bool isDecoder);
     void finishFlushIfPossible();
 
-    void onStart(
-            int64_t startPositionUs = -1,
-            MediaPlayer2SeekMode mode = MediaPlayer2SeekMode::SEEK_PREVIOUS_SYNC);
+    void onStart();
     void onResume();
     void onPause();