Map imms to system_app_service in service_contexts and add
the system_app_service type and allow system_app to add the
system_app_service.

Bug: 16005467
Change-Id: I06ca75e2602f083297ed44960767df2e78991140

Add missing services related to battery, bluetooth, time,
and radio to service_contexts.

Change-Id: I8bf05feb173d49637048c779757013806837fede

Add a service_mananger class with the verb add.
Add a type that groups the services for each of the
processes that is allowed to start services in service.te
and an attribute for all services controlled by the service
manager. Add the service_contexts file which maps service
name to target label.

Bug: 12909011
Change-Id: I017032a50bc90c57b536e80b972118016d340c7d