Merge "Ensure IMS conference host attributes are copied to children." into rvc-dev am: 3c86211bc6 am: 9647468fc4

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/services/Telephony/+/11427628

Change-Id: Ifc47a2e63b195e9bf4c28cdd169483af44f88b7a