vt_vx: check whether the chipset's MMIO range is configured

Avoid attempting to read the SPI bases from the location 0x00000000, all
zeroes mean that the chipset's MMIO area is not enabled.

Change-Id: I5d3a1ba695153e854e0979ae634f8ed97e6b6293
Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Reviewed-on: https://review.coreboot.org/23029
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: David Hendricks <david.hendricks@gmail.com>
1 file changed