Allow multichannel configurations in android.media.AudioTrack
Allow multichannel configurations in android.media.AudioTrack

Compare the channel configuration against a mask of the public
 channel masks in AudioFormat for up to 5.1 with back channels,
 and allow combinations within this mask.

Change-Id: I84b72dfd88d4490f0c67bf10d13151a9eb06f6a8

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base