mb/gigabyte/ga-b75m-d3h: Convert to ASL 2.0 syntax

Generated 'build/dsdt.dsl' are identical.

Change-Id: Ic9b7dfd786ff8e1512c8678590a1dad7c984bca8
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/46165
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>

src/mainboard/gigabyte/ga-b75m-d3h/acpi/thermal.asl

@@ -21,10 +21,10 @@ Scope (\_TZ)
 		Method (CTOK, 1)
 		{
 			// 10th of Degrees C
-			Multiply (Arg0, 10, Local0)
+			Local0 = Arg0 * 10
 
 			// Convert to Kelvin
-			Add (Local0, 2732, Local0)
+			Local0 += 2732
 
 			Return (Local0)
 		}