It's forbidden to use dereference CAR_GLOBAL variables
directly. The notation fails after CAR teardown for
romstage.
Change-Id: I6e6285ca0f520608c2a344517fbac943aeb36d87
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/33995
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>