Expose two carrier configs for additional call settings

Expose KEY_ADDITIONAL_SETTINGS_CALL_WAITING_VISIBILITY_BOOL and
KEY_ADDITIONAL_SETTINGS_CALLER_ID_VISIBILITY_BOOL so carriers
that don't support the feature can override them to false
to hide the feature in calling addtional settings.

Bug: 266479292
Test: m -j
Change-Id: I9ae635c051c0f9e180c36aa1725d0f058f1fd70d