Ignore ro.audio.silent property when playing on REMOTE_SUBMIX

Ignore the effect of the ro.audio.silent property for playback
 threads playing on AUDIO_DEVICE_OUT_REMOTE_SUBMIX as playing
 in those mixes doesn't make a sound.

Bug 27336527

Change-Id: I933cfed29cd72636fd33282e5f2ad05693688b83
1 file changed