Telecom plumbing for SIM call manager voice status

When PhoneAccountRegistrar sees a PhoneAccount with
CAPABILITY_VOICE_CALLING_AVAILABLE registered, it will inform telephony
on the corresponding subId(s) for propagation to ServiceState.

Bug: 205737545
Test: com.android.server.telecom.tests.PhoneAccountRegistrarTest
Change-Id: Ia5894e6ac060975b6e1bd9b78e839e05361e3687