Allow grilservice apps to access app_api_service

Sync solution from ag/12369854 which allow grilservice_app to use
app_api_service.
The tethering_service is one kind of app_api_service.
The activity_service is also one kind of app_api_service.

avc:  denied  { find } for pid=3531 uid=10118 name=tethering scontext=u:r:grilservice_app:s0:c118,c256,c512,c768 tcontext=u:object_r:tethering_service:s0 tclass=service_manager permissive=0

Bug: 169057554
Test: the device can boot to home. check if avc denied from grilservice_app.
Change-Id: I9496323003b19ab97fc2c330ea4dc9b7d5d4dd60
1 file changed