net/vhost: fix parameters string

net/vhost: fix parameters string

Add the missing params to the param string.

Fixes: 39cac2adcad0 ("net/vhost: add client option")
Fixes: 4ce97c6f6b4f ("net/vhost: add an option to enable dequeue zero copy")
Fixes: 447e0d379756 ("net/vhost: add parameter to enable IOMMU feature")
Fixes: 6d6e95cec455 ("net/vhost: add parameter to enable postcopy")
Cc: stable@dpdk.org
Signed-off-by: Tiwei Bie <tiwei.bie@intel.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>