- remove redundant setting of if_mtu as this is set by ether_ifattach(). - set the IFCAP_VLAN_MTU capabilities flag.
- remove redundant setting of if_mtu as this is set by ether_ifattach().
- set the IFCAP_VLAN_MTU capabilities flag.

ok dlg@

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars