Merge "libaudiohal: Add support for audio@7.1" am: 16f5a4508d am: 943480e807 am: 91237018b4

Original change: https://android-review.googlesource.com/c/platform/frameworks/av/+/1973105

Change-Id: I5464a403dc6b4d2ca284ae4caf9593856163256c