Enable FIFO IO for sd devices.  This time committed against the actual tree.
Enable FIFO IO for sd devices.  This time committed against the actual tree.

Tested by lots of people during c2k10

ok phessler krw thib

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