MAAS pillars refactoring for ntp_servers

Prod related: (PROD:26777)

Change-Id: I162c6ef4f28a0cf2105557d1645680089c06896e
diff --git a/maas/region/single.yml b/maas/region/single.yml
index 309ef34..96ba7c6 100644
--- a/maas/region/single.yml
+++ b/maas/region/single.yml
@@ -53,6 +53,10 @@
         name: maasdb
         password: ${_param:maas_db_password}
         username: maas
+      ntp:
+        server_1:
+          enabled: true
+          host: pool.ntp.org
       maas_config:
         main_archive: ${_param:maas_region_main_archive}
         commissioning_distro_series: xenial