Enable host-passthrough for virt control plane

PROD-36510

Change-Id: Iba943e4708c1c905e899671d0afcafc472565e75
diff --git a/salt/control/cluster/infra_proxy_single.yml b/salt/control/cluster/infra_proxy_single.yml
index c9110f8..20ee30b 100644
--- a/salt/control/cluster/infra_proxy_single.yml
+++ b/salt/control/cluster/infra_proxy_single.yml
@@ -29,3 +29,4 @@
               backend: ${_param:infra_proxy_backend_image}
               size: infra.proxy
               cloud_init: ${_param:salt_control_cluster_node_cloud_init_infra_proxy}
+              cpu_mode: ${_param:salt_control_cluster_qemu_cpu_model}