MSIM support for hidden IMS capability and registration query APIs.

Modifies TelephonyManager APIs to better support MSIM devices
and adds a method to query MMTEL IMS Registration technology.

Test: Manual, telephony unit tests.
Bug: 35128252
Merged-In: Ie37185bd3477635094a0db998918ba5ad59842be
Change-Id: Ie37185bd3477635094a0db998918ba5ad59842be