Don't set timestamps, the baseclass handles this for us anyway

sys/androidmedia/gstamcaudiodec.c

@@ -601,10 +601,6 @@ retry:
     orc_memcpy (GST_BUFFER_DATA (outbuf), buf->data + buffer_info.offset,
         buffer_info.size);
 
-    GST_BUFFER_TIMESTAMP (outbuf) =
-        gst_util_uint64_scale (buffer_info.presentation_time_us, GST_USECOND,
-        1);
-
     flow_ret =
         gst_audio_decoder_finish_frame (GST_AUDIO_DECODER (self), outbuf, -1);
   }