Merge "Define FEATURE_TELEPHONY_IMS_SINGLE_REGISTRATION feature" am: 8cb6d95803 am: a30ce7ea41

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1564832

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: If16559974e91b7d231485b8e73416289f629a553