grant country_detector_service app_api_service attribute

All apps should have access to the country_detector service.

avc:  denied  { find } for service=country_detector pid=1802 uid=1010002 scontext=u:r:untrusted_app:s0:c522,c768 tcontext=u:object_r:country_detector_service:s0 tclass=service_manager

Bug: 25766732
Change-Id: Ie3f1a801114030dada7ad70c715a62907a2d264f