[coreboot] [PATCH]kconfig: fix via boards

[Patrick Georgi]

Hi,

the changes to VGA_RUN_ROM and PCI_RUN_ROM broke boards using certain
via chipsets, as they use their own vgabios handling.

The real fix would be to eliminate those copies and move their via
support code (if there is any) to x86emu or so, but this is good enough
for now: x86emu is disabled, and vgabios.c (of the board or northbridge)
can take over.

Signed-off-by: Patrick Georgi