Expose onEmergencyNumberListChanged, semantics change

Expose the onEmergencyNumberListChanged method, which seems to have been
left hidden inadvertently when introduced.

Add a new version of onOutgoingEmergencyCall that supplies a
subscription ID and deprecate the old one. Along with this, send
emergency call events from any subscription to all listeners regardless
of which subscription the listener specified.

Test: atest CtsTelecomTestCases:OutgoingCallTest
Bug: 162647577
bug: 165660452
Change-Id: Ia0e10bfb3376ff82d03a6dbc4bf71c22b0ace366