cpu/intel: Move Power notification ASL code into `common/acpi`

Commit 24813c14 (i945: Consolidate acpi/platform.asl) creates the file
in the directory `src/cpu/intel/model_6dx/acpi`, although the devices
can also use different Intel CPU models like, for example,
`intel/model_6ex` on the Lenovo T60.

Therefore move the file to the directory `src/cpu/intel/common/acpi` so
that other devices, like Intel GM45 based devices, can also include it.

Change-Id: I90126b66a4d70468923622a8e3aebadeafcbf96f
Signed-off-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-on: http://review.coreboot.org/11880
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
diff --git a/src/mainboard/intel/d945gclf/dsdt.asl b/src/mainboard/intel/d945gclf/dsdt.asl
index 8aa8881..8cd9c14 100644
--- a/src/mainboard/intel/d945gclf/dsdt.asl
+++ b/src/mainboard/intel/d945gclf/dsdt.asl
@@ -42,7 +42,7 @@
 	// Thermal Zone
 	//#include "acpi/thermal.asl"
 
-	#include <cpu/intel/model_6dx/acpi/cpu.asl>
+	#include <cpu/intel/common/acpi/cpu.asl>
 
 	Scope (\_SB) {
 		Device (PCI0)