mb/aopen/dxplplusu/acpi: Replace Increment() with ASL 2.0 syntax

Replace `Increment(a)` with `a++`.

Change-Id: I52315e71a51de5c85f11d68854dfe68a474d5cbe
Signed-off-by: Felix Singer <felixsinger@posteo.net>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/60585
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr>

src/mainboard/aopen/dxplplusu/acpi/e7505_pri.asl

@@ -37,7 +37,7 @@ Device (MBRS)
 		CreateQWordField (MSBF, \_SB.MBRS._Y1C._LEN, LELM)
 
 		And (\_SB.PCI0.RLAR, 0x03FF, Local1)
-		Increment (Local1)
+		Local1++
 		If (LGreater (Local1, 0x40))
 		{
 			ShiftLeft (Local1, 0x1A, LELM)