Broadcast outgoing emergency calls from Telecom

This change moves the sending of the
PhoneStateListener#onOutgoingEmergencyCall event to Telecom for
testability.

Also allow test emergency calls placed by CTS to make the call over
the test phone account that the test registered.

Bug: 162647577
Test: atest CtsTelecomTestCases:OutgoingCallTest
Change-Id: I844f9e1502f827b42e09f3a0e3ca31fd7b0fb916