let vic attach to the virtual pcnet hardware in vmware.
let vic attach to the virtual pcnet hardware in vmware.

tested on real hardware by jsing@ to ensure pcn(4) isnt affected in the
real world.

ok jsing@

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