Merge "Expose APIs for SipTransport registration management" am: b3f8228f21 am: 3434bcd027 am: 9c0631b52d

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

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I8d2cafe151aab5315be84dc21543f284069961d7