ec/quanta/it8518/acpi: Replace Increment() with ASL 2.0 syntax

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

Change-Id: I5de24042a1a69975c980f6ef10babf6f478b8d69
Signed-off-by: Felix Singer <felixsinger@posteo.net>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/60583
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr>

src/ec/quanta/it8518/acpi/ec.asl

@@ -556,8 +556,7 @@ Device (EC0)
 		// TODO Which temperature corresponds to the CPU?
 		Store (TMP0, Local0)
 		/* So that we don't get a warning that Local0 is unused.  */
-		Increment (Local0)
-
+		Local0++
 	}
 
 /* Attention Codes