Merge "Define FEATURE_TELEPHONY_IMS_SINGLE_REGISTRATION feature" am: 8cb6d95803 am: a30ce7ea41 am: 5bbee4a0bb

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

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I65ab2d2c40512291e34f64e6ac070fbae4d20475