Merge "Make RTT while roaming configurable" am: 5ed251d5f2

Original change: https://android-review.googlesource.com/c/platform/packages/services/Telephony/+/1558634

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I0d02971dcf9a02b8da8b076dfdd28bfe2e6f0182