added system.linux.system.repo.mcp.salt where missing

Change-Id: Iec33efa97a7638437ddfe280ec3f2c69889e791f
diff --git a/classes/cluster/k8s-ha-calico-syndic/infra/config.yml b/classes/cluster/k8s-ha-calico-syndic/infra/config.yml
index 4e96666..21e7656 100644
--- a/classes/cluster/k8s-ha-calico-syndic/infra/config.yml
+++ b/classes/cluster/k8s-ha-calico-syndic/infra/config.yml
@@ -1,5 +1,6 @@
 classes:
 - system.linux.system.repo.ubuntu
+- system.linux.system.repo.mcp.salt
 - system.openssh.client.lab
 - system.salt.master.pkg
 - system.salt.minion.ca.salt_master