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

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



Change-Id: I9b34e3ed31237598d5e708d80fb40c7e3b67a38b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>