Add carrier config for ignoring user RTT setting

Add a carrier config to ignore the user's RTT mode setting for purposes
of IMS registration and default outgoing/incoming call behavior.

Bug: 136035164
Test: manual
Change-Id: I481fb945fd76181a0c59cb433c2959b532127153
Merged-In: I481fb945fd76181a0c59cb433c2959b532127153
1 file changed