[coreboot] [PATCH]unify types in kconfig

[Myles Watson]

> attached patch makes PCI_ROM_RUN a boolean (like it is elsewhere), which
> is the correct choice, too. Avoids type problems in kconfig
I agree with the type change.  I think setting it in a mainboard Kconfig is
a mistake.  I tried to build Serengeti_cheetah without VGA to test something
and it was a pain.

> Signed-off-by: Patrick Georgi <patrick.georgi at coresystems.de>
Acked-by: Myles Watson <mylesgw at gmail.com>

Thanks,
Myles