nb/intel/*/gma.c: Skip NGI when VGA decode is not enabled

Writes to VGA MEM and IO by NGI are invalid if the IGD is not decoding
them.

Change-Id: I4b9329d14105eb563a0d4aea6ef75ff11febf6df
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/27984
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>

0 files changed, 0 insertions, 0 deletions