RTT bugfixes and logging

Add logging for RTT interface with IMS stack
Fix a few bugs relating to RTT requests and initialization
Add a method to set the RTT config value in the IMS stack

Bug: 63934808
Bug: 72156722
Test: manual
Change-Id: I44934ef53c9cc821582b381d82ee6834a9bdfe6a
Merged-In: I44934ef53c9cc821582b381d82ee6834a9bdfe6a