soc/intel/cannonlake: Remove unused header files from southbridge.asl

Change-Id: I1f970db22f87e8eba0129ca049f75d16539644a5
Signed-off-by: Aamir Bohra <aamir.bohra@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34270
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Bora Guvendik <bora.guvendik@intel.com>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr>
Reviewed-by: Subrata Banik <subrata.banik@intel.com>

src/soc/intel/cannonlake/acpi/southbridge.asl

@@ -15,11 +15,6 @@
  * GNU General Public License for more details.
  */
 
-#include <intelblocks/itss.h>
-#include <intelblocks/pcr.h>
-#include <soc/itss.h>
-#include <soc/pcr_ids.h>
-
 /* PCI IRQ assignment */
 #include "pci_irqs.asl"