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: Iaaf41d250c0ca67d92e457349c0110d78acf6460
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>