sb/intel/i82801gx: Use SOUTHBRIDGE_INTEL_COMMON_PMCLIB

Use common code to detect ACPI S3.

Tested on Thinkpad X60.

Change-Id: Ia759a9ed141efc8130860300f2a8961f0c084d70
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32041
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>

src/mainboard/getac/p470/romstage.c

@@ -28,6 +28,7 @@
 #include <northbridge/intel/i945/i945.h>
 #include <northbridge/intel/i945/raminit.h>
 #include <southbridge/intel/i82801gx/i82801gx.h>
+#include <southbridge/intel/common/pmclib.h>
 #include "option_table.h"
 
 static void setup_special_ich7_gpios(void)