Introduce LE Audio software provider for bluetooth audio 2.1 am: b5f2d23e26 am: a1663edb70 am: 9e834165ad

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/1404810

Change-Id: Ifdfb5daf185e8361d0dbe7bffcfe5f38aaf34d30