Internal Telephony Support For Cellular Identifier Disclosure HALs

This implements the required interfaces for the new HALs. Wiring
together the actual implementation of the unsolicited call to
`cellularIdentifierDisclosed` is left as a TODO and will be gated behind a feature flag.

Bug: 276752426
Test: m
Change-Id: I1859bd205fb0d36b87c56fef747588b60f9d1a3c