Erase bufferCount in audio output.

Test: Build and run on phone

Change-Id: I8fd62b5ac1f343d6b397b3221c1285b22bf8cd06
diff --git a/media/libmediaplayer2/include/mediaplayer2/MediaPlayer2AudioOutput.h b/media/libmediaplayer2/include/mediaplayer2/MediaPlayer2AudioOutput.h
index 5d5b8e4..ee67abf 100644
--- a/media/libmediaplayer2/include/mediaplayer2/MediaPlayer2AudioOutput.h
+++ b/media/libmediaplayer2/include/mediaplayer2/MediaPlayer2AudioOutput.h
@@ -58,7 +58,7 @@
 
     virtual status_t open(
             uint32_t sampleRate, int channelCount, audio_channel_mask_t channelMask,
-            audio_format_t format, int bufferCount,
+            audio_format_t format,
             AudioCallback cb, void *cookie,
             audio_output_flags_t flags = AUDIO_OUTPUT_FLAG_NONE,
             const audio_offload_info_t *offloadInfo = NULL,