Merge "AAudio: Add comments to missing result types" into udc-dev am: f19465f4 am: f41ffa7b

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/av/+/22104382



Change-Id: I102862082944fc73b6227b42e010009dbfff2ba8
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>