Deal with the fact that we need to control an external PHY attached to TSEC2 through the registers of TSEC1.  Makes the first ethernet port on the rb600 usable.
Deal with the fact that we need to control an external PHY attached to TSEC2
through the registers of TSEC1.  Makes the first ethernet port on the rb600
usable.

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