Ensure emergency calls dialed over IMS use CLIR suppression.

When dialing an emergency call, the framework will use the user's chosen
CLIR mode (network default, invocation (show caller ID to remote),
suppression (hide caller ID to remote).

This change ensures that the telephony framework will show the caller's
ID when an emergency call is dialed over IMS.

Test: Manual, unit test
Bug: 64049180
Change-Id: Ic52caf4bc47045ac0d9b0d024882b30d057b3a16