Merge "Add adhoc conference APIs to RemoteConnection and RemoteConnectionService." am: 329c6ff777 am: e40cfa60de am: 6a55cd1644

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1388908

Change-Id: Ifc88640d6fb38e14a58ad802f520b0c0ee0b35b8