Validate_Config() had the full `Port_Config` as parameter, though we
only accessed the modeline. Make that explicit so we can also call it
when we don't have the full config available.
Change-Id: Ia4620d1ffa1a3cd098d721d84f2453f2dc19da2a
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/23163
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>