mb/roda/rk9/acpi: Replace Multiply(a,b) with ASL 2.0 syntax

Replace `Multiply (a, b)` with `a * b`.

Change-Id: I8697f62cf5627ace8c4eac0caec7962171bb3541
Signed-off-by: Felix Singer <felixsinger@posteo.net>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/60567
Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/roda/rk9/acpi/thermal.asl

@@ -6,7 +6,7 @@ Scope (\_TZ)
 {
 	/* degree Celsius to deci-Kelvin (ACPI temperature unit) */
 	Method(C2dK, 1) {
-		Local0 = 2732 + Multiply (Arg0, 10)
+		Local0 = 2732 + Arg0 * 10
 		Return (Local0)
 	}