Add a soc specific callback for getting the IIO IOAPIC enumeration ID.
Tested on ocp/deltalake.
Change-Id: Id504c2159066e6cddd01d30649921447bef17b12
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/47302
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Marc Jones <marc@marcjonesconsulting.com>