Merge "Expose APIs for SipTransport registration management" am: b3f8228f21 am: 3434bcd027

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1526901

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I5c91a4c08de8b108336dccbf5760f56d00813869