[SeaBIOS] Updated Geode vga bios

[Kevin O'Connor]

I went through the latest Geode VGA BIOS patch and updated it to merge
with the current tree.  I also fixed it up so that it doesn't need to
modify the common code.

Unfortunately, I have no ability to test this code.  So, I don't know
if it works properly.  Hopefully someone with the hardware can run a
test.

-Kevin