Audio masks for "front wide" channels

Add "front wide" left/right channels to support
immersive audio configurations such as 9.1.6
Add definitions for configurations 9.1.x that
take advantage of front wides.

Bug: 188502620
Test: atest libmedia_helper_tests
Change-Id: Ib953892221d0d278bd29b3d3fd9bb92a79f3426d
3 files changed