sio/acpi/pnp.asl: Replace Not(a) with ASL 2.0 syntax

Change-Id: Icbd2ab736b9fc3300ee82896c31b373fe92e1d54
Signed-off-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/71509
Reviewed-by: Felix Singer <felixsinger@posteo.net>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/superio/acpi/pnp.asl b/src/superio/acpi/pnp.asl
index 4d3adaa..1f63e82 100644
--- a/src/superio/acpi/pnp.asl
+++ b/src/superio/acpi/pnp.asl
@@ -87,7 +87,7 @@
 /* Disable power saving mode */
 #define PNP_GENERIC_PS0(PM_REG, PM_VAL, PM_LDN) \
 	ENTER_CONFIG_MODE (PM_LDN)\
-	  PM_REG = Not(PM_VAL) \
+	  PM_REG = ~PM_VAL \
 	EXIT_CONFIG_MODE ()
 
 /* Enable power saving mode */