Patching around channel-index mask problem in AudioRecord. DO NOT MERGE

Use channel-position mask for <= 2 channels in AudioRecord.
Fix number of channels for the CTSVerifier test to 2 channels.

Bug: 118451318
Bug: 114298735
Test: Build/install CTSVerifier. Run "USB AudioRecord Test". Note signal on 2 channels.

Change-Id: Ie95f683d7451a8d2863ab11f4b437ca365cc061f
3 files changed