nb/intel/gm45/gma: Use res2mmio() directly for GTT access

This is how res2mmio() is supposed to be used and there was no other
use of the `mmio` variable left anyway.

Change-Id: Ifa4645bcc9ae971966587d9b67662b9dc8bae3d0
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/75377
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Felix Singer <service+coreboot-gerrit@felixsinger.de>

0 files changed, 0 insertions, 0 deletions