Enable host-passthrough for virt control plane

PROD-36510

Change-Id: Iba943e4708c1c905e899671d0afcafc472565e75
diff --git a/salt/control/cluster/openstack_billing_single.yml b/salt/control/cluster/openstack_billing_single.yml
index ae724e9..c2b41eb 100644
--- a/salt/control/cluster/openstack_billing_single.yml
+++ b/salt/control/cluster/openstack_billing_single.yml
@@ -28,3 +28,4 @@
               backend: ${_param:openstack_billing_backend_image}
               size: openstack.billing
               cloud_init: ${_param:salt_control_cluster_node_cloud_init_openstack_billing}
+              cpu_mode: ${_param:salt_control_cluster_qemu_cpu_model}