Resolve hidden TelephonyRegistryManager APIs

Promote notifyCallStateChangedForAllSubscriptions and
notifyOutgoingEmergencyCall as part of the Telecom
modularization cleanup.

Bug: 308212734
Bug: 311773409
Test: atest TelecomUnitTests
Test: atest TelephonyRegistryManagerTest (added missing CTS for
notifyOutgoingEmergencyCall)

Change-Id: Ia5cf12107b82f1baf4ac61d20b132d6afebe4d2a