gigabit only phys don't have any of the 10/100 bits set in BMSR, but the EXTSTAT bit -is- set.  Add EXTSTAT to the early check of BMSR so that sk/xmphy can attach correctly.
gigabit only phys don't have any of the 10/100 bits set in BMSR, but the
EXTSTAT bit -is- set.  Add EXTSTAT to the early check of BMSR so that
sk/xmphy can attach correctly.

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