Turn off RTT if a carrier doesn't support it am: b209db8d am: 069713fd am: f460f2f3 am: 76b58418

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/opt/net/ims/+/12120134

Change-Id: Ic963855207321d9d13d0196612b1479bfab8718e