[coreboot] asus p2b and p2-99

[Branden Waldner]

I got an actual p2b motherboard a few months ago so that I could
actually test it properly and not just claim the p2b build works on
the p2-99. It seems to work fine and flashrom works on the p2b (but
not the p2-99).

I believe there was some discussion and a patch to setup the p2-99 as
a variant of the p2b and if the patch is still around, it would
probably be best to try to figure out if that is what we should do.

I'd like to get around to doing some more work with coreboot yet, but
I'll probably be too busy for a while and really haven't gotten around
to it up until now either. Sorry for just making more work out of an
old motherboard.