(Emergency call routing type) Determined routing type for emergency numbers

Default set as emergency call.
Based on the value of is_normal_routing field from database routing type is
modified.
If is_normal_routing is true and mnc list is null then normal routing.
If list of mnc not null then normal routing only for those mnc's.
support to use DB routing while merging of duplicate numbers.

Test: atest EmergencyNumberTrackerTest & emergency call test in device
Bug: 238359415
Change-Id: I907939de6b0c281c51e457ed4b4400af9384191b