On sparc64, prefer the local-mac-address provided by the PROM.  Makes sure the MAC address on the builtin ports of the Sun Fire V215 match what is used by the PROM.
On sparc64, prefer the local-mac-address provided by the PROM.  Makes sure the
MAC address on the builtin ports of the Sun Fire V215 match what is used by
the PROM.

ok deraadt@

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