CONFIG_ARCH gives false positives for CONFIG_ARCH_X86_64_PGTBL_LOC so
use a different string: 'CONFIG_MAINBOARD_DIR'.
Change-Id: Ie5d4fc4693bc303afb16884c53c9ca4d1778a5cb
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/74220
Reviewed-by: Lean Sheng Tan <sheng.tan@9elements.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Maximilian Brune <maximilian.brune@9elements.com>
