AudioTrack: fix deprecated usage of stream types (Android O)

04-21 13:39:23.662 15197  15630             AudioTrack  W  Use of stream types is deprecated for operations other than volume control
04-21 13:39:23.662 15197  15630             AudioTrack  W  See the documentation of AudioTrack() for what to use instead with android.media.AudioAttributes to qualify your playback use case

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