[LinuxBIOS] [PATCH] Add initial serial output for Via vt82c686

[Corey Osgood]

This patch is just for initial serial output for the Via vt82c686(a/b) 
southbridge, no more and no less. SMBus and the rest of the SuperI/O 
functions are yet to be written. I've confirmed that this works on Tyan 
S2507 (vt686b), and it should also work fine on vt686a. This is based 
rather loosely on Uwe's code for the SMSC FDC37M60x.

Signed-off-by: Corey Osgood