SELinux permissions for companion device system service

Required for I0aeb653afd65e4adead13ea9c7248ec20971b04a

Test: Together with I0aeb653afd65e4adead13ea9c7248ec20971b04a, ensure that the
system service works
Bug: b/30932767
Change-Id: I994b1c74763c073e95d84222e29bfff5483c6a07

private/service_contexts

@@ -22,6 +22,7 @@ com.android.net.IProxyService             u:object_r:IProxyService_service:s0
 commontime_management                     u:object_r:commontime_management_service:s0
 common_time.clock                         u:object_r:mediaserver_service:s0
 common_time.config                        u:object_r:mediaserver_service:s0
+companion_device                          u:object_r:companion_device_service:s0
 connectivity                              u:object_r:connectivity_service:s0
 connectivity_metrics_logger               u:object_r:connectivity_metrics_logger_service:s0
 connmetrics                               u:object_r:connmetrics_service:s0

public/service.te

@@ -44,6 +44,7 @@ type clipboard_service, app_api_service, system_server_service, service_manager_
 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 companion_device_service, app_api_service, system_server_service, service_manager_type;
 type connectivity_metrics_logger_service, app_api_service, system_server_service, service_manager_type;
 type connectivity_service, app_api_service, system_server_service, service_manager_type;
 type connmetrics_service, app_api_service, system_server_service, service_manager_type;