Merge "Return aaudio_result_t for validating channel mask." into udc-dev am: 63ea3704

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/av/+/21522124



Change-Id: Ia9d3d723e80a39a9606fee90faafbe78b667fb33
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>