[coreboot] simple useful utility

[ron minnich]

if anybody wants to dash this off today, we need it.

The utillity would read the routing registers in k8 north and print
out what they mean. You get this info from config space.

I wrote one of these for the ultra 40 project and then lost it when I
shipped the machine back to xtreme data ...

it's easy but I don't have time today. It might tell us what is up
with v3/serengeti.

ron