Some settings don't make sense like specifying input/output on native
ports or high/low on input ports.
Change-Id: Ib37837b9cdb8bb05e2523e0c43cc71fe4fbf243b
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/31187
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>