arch/x86/acpi: Replace ShiftRight() with ASL 2.0 syntax

Change-Id: Iaa99d9dc4cf12a7431be1610d339cf78116f8bea
Signed-off-by: Felix Singer <felixsinger@posteo.net>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/60717
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Sean Rhodes <sean@starlabs.systems>

src/arch/x86/acpi/debug.asl

@@ -90,7 +90,7 @@ Method(DBGN, 1)
 */
 Method(DBGB, 1)
 {
-	ShiftRight(Arg0, 4, Local0)
+	Local0 = Arg0 >> 4
 	DBGN(Local0)
 	DBGN(Arg0)
 }
@@ -101,7 +101,7 @@ Method(DBGB, 1)
 */
 Method(DBGW, 1)
 {
-	ShiftRight(Arg0, 8, Local0)
+	Local0 = Arg0 >> 8
 	DBGB(Local0)
 	DBGB(Arg0)
 }
@@ -112,7 +112,7 @@ Method(DBGW, 1)
 */
 Method(DBGD, 1)
 {
-	ShiftRight(Arg0, 16, Local0)
+	Local0 = Arg0 >> 16
 	DBGW(Local0)
 	DBGW(Arg0)
 }