Add the REGISTRATION_TECH_NR Tech type

Adds the new NR registration technology for devices
that support IMS over NR so that the APIs can report
this technology.

Bug: 179724463
Test: atest CtsTelephonyTestCases
Merged-In: I4b0f9882dcf36e2ff7151778cbadb8e83513df5a
Change-Id: I4b0f9882dcf36e2ff7151778cbadb8e83513df5a