Use newly defined NR Registration technology

1) Consolidate MMTEL capability enable/disable logic
instead of using branching code paths for each setting's
enable/disable logic.
2) Add NR reg tech for enabling/disabling capabilities
based on NR carrier config.

Bug: 179724463
Test: atest ImsCommonTests
Merged-In: I347cbe56d7e2bc96e9d2e7928d8ac3368a0f00c6
Change-Id: I347cbe56d7e2bc96e9d2e7928d8ac3368a0f00c6