[coreboot] patch: add in smbus support for mcp55

[ron minnich]

Committed revision 728.

with your corrections.

I really kind of need a go/no-go on the PCI stuff I just posted. I am fine with
either an ACK OR a "no, but here is the right patch, what do you think?"

A code-less NAK would be less okay :-)

Anybody?

thanks

ron