[coreboot] [PATCH]Kconfig: fix QEmu build, reduce bootblock size

[Myles Watson]

> attached patches do:
> 20090813-1:
>   AMD selected a couple of options that are incompatible with QEmu (and
> probably others). Only select them for AMD
Can we include that file conditionally instead?  That file should never be
included with Qemu, right?

Thanks,
Myles