disable the fifo on m series systems by telling the driver its a 16550 which stops the MI com code from probing it as a 16550a.
disable the fifo on m series systems by telling the driver its a 16550
which stops the MI com code from probing it as a 16550a.

hopefully this will prevent the awesome faults on the mainboard from
locking the system up.

ok kettenis@

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