soc/amd/picasso/acpi: rename cpu.asl to pnot.asl

After the patch that moved the generation of the PPKG object to
Picasso's acpi.c, only the PNOT object remained in its cpu.asl, so
rename it to pnot.asl.

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: Ic77dacb146aa823fc99f779f465fff28b2aead68
Reviewed-on: https://review.coreboot.org/c/coreboot/+/62538
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Raul Rangel <rrangel@chromium.org>

src/mainboard/amd/bilby/dsdt.asl

@@ -21,8 +21,8 @@ DefinitionBlock (
 	/* PCI IRQ mapping for the Southbridge */
 	#include <pcie.asl>
 
-	/* Describe the processor tree (\_PR) */
-	#include <cpu.asl>
+	/* Power state notification to ALIB */
+	#include <pnot.asl>
 
 	/* Contains the supported sleep states for this chipset */
 	#include <soc/amd/common/acpi/sleepstates.asl>

src/mainboard/amd/mandolin/dsdt.asl

@@ -21,8 +21,8 @@ DefinitionBlock (
 	/* PCI IRQ mapping for the Southbridge */
 	#include <pcie.asl>
 
-	/* Describe the processor tree (\_PR) */
-	#include <cpu.asl>
+	/* Power state notification to ALIB */
+	#include <pnot.asl>
 
 	/* Contains the supported sleep states for this chipset */
 	#include <soc/amd/common/acpi/sleepstates.asl>

src/mainboard/google/zork/dsdt.asl

@@ -22,8 +22,8 @@ DefinitionBlock (
 	/* PCI IRQ mapping for the Southbridge */
 	#include <pcie.asl>
 
-	/* Describe the processor tree (\_PR) */
-	#include <cpu.asl>
+	/* Power state notification to ALIB */
+	#include <pnot.asl>
 
 	/* Contains the supported sleep states for this chipset */
 	#include <soc/amd/common/acpi/sleepstates.asl>