Merge "audio: Update README.md to add info about the AIDL version" am: fa3c9cf1a6

Original change: https://googleplex-android-review.googlesource.com/c/platform/hardware/interfaces/+/19460962

Change-Id: I06f0b7580b89272c62e2408aaebf0741c8f729b5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>