The .disable function pointer is only referenced inside
set_vga_bridge_bits() and is used to unset VGA decoding on the
internal GFX device.
Change-Id: I6888b08ac11ba2431601fa179d063cee0bb93370
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/51007
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>