nb/intel/i945: Define and use a default MMCONF_BASE_ADDRESS

Change-Id: I15550b1cc1a7ccfecba68a46ab2acaee820575b9
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/19648
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
11 files changed