Fix typo for cpu_mode pillar

PROD-36510

Change-Id: I6ddc9d3592a0446ba5e51abaea12be718f22a642
diff --git a/salt/control/cluster/openstack_billing_single.yml b/salt/control/cluster/openstack_billing_single.yml
index c2b41eb..7ca2fdc 100644
--- a/salt/control/cluster/openstack_billing_single.yml
+++ b/salt/control/cluster/openstack_billing_single.yml
@@ -28,4 +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}
+              cpu_mode: ${_param:salt_control_cluster_qemu_cpu_mode}