Allow all apps to discover contexthub_service

This allows system app, regular app as well as test app to access
ContextHubManager API. Additional "signature|privilige" permission
requirement (LOCATION_HARDWARE) still exist to prevent security
issues, misuse and abuse.

Change-Id: I47f3d243a3de7f1202c933fc715a935c43cf319b

priv_app.te

@@ -36,7 +36,6 @@ allow priv_app app_api_service:service_manager find;
 allow priv_app system_api_service:service_manager find;
 allow priv_app persistent_data_block_service:service_manager find;
 allow priv_app recovery_service:service_manager find;
-allow priv_app contexthub_service:service_manager find;
 
 # Traverse into /mnt/media_rw for bypassing FUSE daemon
 # TODO: narrow this to just MediaProvider

service.te

@@ -35,7 +35,7 @@ type battery_service, system_server_service, service_manager_type;
 type bluetooth_manager_service, app_api_service, system_server_service, service_manager_type;
 type cameraproxy_service, system_server_service, service_manager_type;
 type clipboard_service, app_api_service, system_server_service, service_manager_type;
-type contexthub_service, system_server_service, service_manager_type;
+type contexthub_service, app_api_service, system_server_service, service_manager_type;
 type IProxyService_service, app_api_service, system_server_service, service_manager_type;
 type commontime_management_service, system_server_service, service_manager_type;
 type connectivity_service, app_api_service, system_server_service, service_manager_type;