mb/amd/mandolin/.../sleep.asl: Remove unnecessary variable

There is no reason to create a named variable. We can just return the
package.

BUG=b:153001807, b:154756391
TEST=None

Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Change-Id: Ic0ca2e6d4fb833c68d29e9948a670ace7c89b6a5
Reviewed-on: https://review.coreboot.org/c/coreboot/+/43464
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>

src/mainboard/amd/mandolin/acpi/sleep.asl

@@ -1,8 +1,5 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
-/* Wake status package */
-Name(WKST,Package(){Zero, Zero})
-
 /*
 * \_PTS - Prepare to Sleep method
 *
@@ -25,10 +22,7 @@ Method(_PTS, 1) {
 	/* DBGO(Arg0) */
 	/* DBGO("\n") */
 
-	/* Clear wake status structure. */
 	Store(0, PEWD)
-	Store(0, Index(WKST,0))
-	Store(0, Index(WKST,1))
 	Store(7, UPWS)
 } /* End Method(\_PTS) */
 
@@ -53,5 +47,5 @@ Method(\_WAK, 1) {
 	/* DBGO(Arg0) */
 	/* DBGO(" to S0\n") */
 
-	Return(WKST)
+	Return(Package(){Zero, Zero})
 } /* End Method(\_WAK) */