Continue preparations for common ACPI code.
Add code from skx and common/acpi to check the SCI register
instead of using a define.
Change-Id: I6b638d28775320894a6ab24ef486e67c181591eb
Signed-off-by: Marc Jones <marcjones@sysproconsulting.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/45844
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>