Add NetworkTimeUpdateService

NetworkTimeUpdateService has been registered as a system service, so that
its dump state can be included into bugreports.

Bug: 23983739
Change-Id: I0d364009ba4630dcfd1d22c647195e33eedaa4e0

service.te

@@ -74,6 +74,7 @@ type netpolicy_service, app_api_service, system_server_service, service_manager_
 type netstats_service, app_api_service, system_server_service, service_manager_type;
 type network_management_service, app_api_service, system_server_service, service_manager_type;
 type network_score_service, system_api_service, system_server_service, service_manager_type;
+type network_time_update_service, system_server_service, service_manager_type;
 type notification_service, app_api_service, system_server_service, service_manager_type;
 type otadexopt_service, system_server_service, service_manager_type;
 type package_service, app_api_service, system_server_service, service_manager_type;

service_contexts

@@ -86,6 +86,7 @@ netpolicy                                 u:object_r:netpolicy_service:s0
 netstats                                  u:object_r:netstats_service:s0
 network_management                        u:object_r:network_management_service:s0
 network_score                             u:object_r:network_score_service:s0
+network_time_update_service               u:object_r:network_time_update_service:s0
 nfc                                       u:object_r:nfc_service:s0
 notification                              u:object_r:notification_service:s0
 otadexopt                                 u:object_r:otadexopt_service:s0