Merge "Integrate IMS single registration feature into APIs" am: a271c76c47 am: c1743106e8 am: 89a6e1bf36

Original change: https://android-review.googlesource.com/c/platform/packages/services/Telephony/+/1564733

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I5cd57ab34948bc9f6a8ffb40609a11977e52421b