adding epia

[ron minnich]

I've added a few things for epia.

epia folks please look in freebios2 at

src/northbridge/via/vt8601 (not done yet) 
src/southbridge/via/vt8231

the big thing to look at in the southbridge is how it is set up. The 
previous code was really out of touch w.r.t. the way you're supposed to do 
these chips nowadays, so this modified version is worth reading.

I'll try to get more done on the mainboard today/tomorrow.

ron
p.s. freebios2 learning curve is a bit steep, but once you get the hang of 
it, you will probably like it. It got complicated when the k8 went in.