libaudiohal@aidl: Implement setConnectedState am: e93a086751 am: ed6557caf7

Original change: https://android-review.googlesource.com/c/platform/frameworks/av/+/2516265

Change-Id: If5a07e07adad179ee6a7c730c8ec1f80aa999a17
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>