Merge "Block normal outgoing call when there's an ongoing emergency call." into sc-dev am: c5411e1a0b am: 680d92eb93 am: ec6bcbc616

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/services/Telecomm/+/14484356

Change-Id: I24885fde355a59f3afcaf51053aec222aaf08d1b