Remove known system_server service accesses from auditing.

Address observed  audit logs of the form:
granted  { find } for service=XXX scontext=u:r:YYY:s0:c512,c768 tcontext=u:object_r:XXX_service:s0 tclass=service_manager

in order to record existing relationships with services.

Bug: 18106000
Change-Id: I99a68f329c17ba67ebf3b87729b8405bdc925ef4