AGP VGA support committed

[Li-Ta Lo]

Hello,

I committed the support for AGP/VGA in AMD K8. The IO/MEM resources
should be set correctly and the only thing one have to do to init
an Nvidia AGP card is run the testbios emulator with the VGA BIOS.

I am going to move the emulator into LinuxBIOS in the near future
so we can have VGA console earilier.

Ollie