[LinuxBIOS] Add support for Via vt82c686a

[Corey Osgood]

Okay, I'm hoping that I'm doing this right. This is basically just a 
hacked up version of the vt8231 to support the vt82c686a. I can't 
confirm that it works entirely, but it does work far enough to provide 
serial output. I've added what I hope are the correct GPL headers.

Signed off by: Corey Osgood <corey_osgood at verizon.net>
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