MediaPlayer2: use protobuf instead of parcel in invoke()

Test: pass MediaPlayer2Test
Bug: 63934228
Change-Id: Ie3d7c9352f369b6481e35c98e40b736cdff23204
diff --git a/media/libmediaplayer2/include/mediaplayer2/mediaplayer2.h b/media/libmediaplayer2/include/mediaplayer2/mediaplayer2.h
index 43fba23..628e732 100644
--- a/media/libmediaplayer2/include/mediaplayer2/mediaplayer2.h
+++ b/media/libmediaplayer2/include/mediaplayer2/mediaplayer2.h
@@ -90,7 +90,7 @@
             status_t        setVolume(float leftVolume, float rightVolume);
             void            notify(int64_t srcId, int msg, int ext1, int ext2,
                                    const Parcel *obj = NULL);
-            status_t        invoke(const Parcel& request, Parcel *reply);
+            status_t        invoke(const PlayerMessage &request, PlayerMessage *reply);
             status_t        setMetadataFilter(const Parcel& filter);
             status_t        getMetadata(bool update_only, bool apply_filter, Parcel *metadata);
             status_t        setAudioSessionId(audio_session_t sessionId);