Make backup service app_api_service.

Backup service needs to be accessible to all apps to notify the system when
something changes which is being backed-up.

Bug: 18106000
Change-Id: I8f34cca64299960fa45afc8d09110123eb79338b

service.te

@@ -20,7 +20,7 @@ type appops_service, app_api_service, system_server_service, service_manager_typ
 type appwidget_service, app_api_service, system_server_service, service_manager_type;
 type assetatlas_service, app_api_service, system_server_service, service_manager_type;
 type audio_service, app_api_service, system_server_service, service_manager_type;
-type backup_service, system_api_service, system_server_service, service_manager_type;
+type backup_service, app_api_service, system_server_service, service_manager_type;
 type batterystats_service, app_api_service, system_server_service, service_manager_type;
 type battery_service, system_server_service, service_manager_type;
 type bluetooth_manager_service, system_api_service, system_server_service, service_manager_type;