mb/aopen/dxplplusu/acpi: Replace LNotEqual(a,b) with ASL 2.0 syntax

Replace `LNotEqual(a, b)` with `a != b`.

Change-Id: Iae3343e66906a8123b3d8de2b67948f286e4ad32
Signed-off-by: Felix Singer <felixsinger@posteo.net>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/60704
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Sean Rhodes <sean@starlabs.systems>

src/mainboard/aopen/dxplplusu/acpi/superio.asl

@@ -79,7 +79,7 @@ Method (_CRS, 0, NotSerialized)
 	ShiftLeft (IOM1, 0x08, IOM1)
 	Or (\_SB.PCI0.ICH0.SMSC.IOAL, IOM1, IOM1)
 	Store (IOM1, IOM2)
-	If (LNotEqual (IOM1, 0x00))
+	If (IOM1 != 0)
 	{
 		Store (0x80, IOML)
 	}