mb/intel/icelake_rvp: Include cpu.asl in DSDT ACPI table

This implementation adds support of PNOT method included in cpu.asl.
It is needed to notify CPU APCI device to re-evaluate the _CST table
for list of supported C-states.

Change-Id: I135cc3aa32a912c8ad3449d063d533f8873fcc94
Signed-off-by: Aamir Bohra <aamir.bohra@intel.com>
Reviewed-on: https://review.coreboot.org/c/29861
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-by: Subrata Banik <subrata.banik@intel.com>

src/mainboard/intel/icelake_rvp/dsdt.asl

@@ -29,6 +29,9 @@ DefinitionBlock(
 	// global NVS and variables
 	#include <soc/intel/icelake/acpi/globalnvs.asl>
 
+	// CPU
+	#include <soc/intel/icelake/acpi/cpu.asl>
+
 	Scope (\_SB) {
 		Device (PCI0)
 		{