RTT bugfixes, part 5

* Add support for properly setting the ImsStreamMediaProfile's RTT flag
when answering an incoming call
* Add logging

Bug: 72648661
Bug: 72762206
Test: manual, with telecom testapp dialer over the network
Change-Id: I93dfa217b9bf004e95919c3dded8a59cbb14b57e
Merged-In: I93dfa217b9bf004e95919c3dded8a59cbb14b57e