Add a test API for sending EVENT_DISPLAY_EMERGENCY_MESSAGE

Bug: 305030915
Test: SMS, MMS, call with live network.
atest SatelliteSOSMessageRecommenderTest TelephonyConnectionServiceTest ImsCallingTest
Manually triggered an emergency call and verify the log as expected.

Change-Id: Ieb9b5d9cde95bcb1d9d4a53a933e0e867b459820
4 files changed