soc/intel/xeon_sp: Use common ASL code for xeon_sp

Move and use the common xeon_sp/cpx/acpi asl for skx/.
There were only minor whitespace differences between the directories.

Update the mainboards to build the moved files.

TiogaPass coreboot.rom checked with BUILD_TIMELESS.

Change-Id: I5058a3fe8d96075a266fb92f10707bb94308c85b
Signed-off-by: Marc Jones <marcjones@sysproconsulting.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/45217
Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Jay Talbott <JayTalbott@sysproconsulting.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/intel/cedarisland_crb/dsdt.asl

@@ -21,7 +21,7 @@ DefinitionBlock(
 	{
 		Device (PCI0)
 		{
-			#include <soc/intel/xeon_sp/cpx/acpi/southcluster.asl>
+			#include <soc/intel/xeon_sp/acpi/southcluster.asl>
 			#include <soc/intel/common/block/acpi/acpi/lpc.asl>
 
 		}