mb/google/kahlee: Replace Multiply(a,b,c) with ASL 2.0 syntax

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

Change-Id: I19835510b89cd243277f0c9701209c81bdf6ea29
Signed-off-by: Felix Singer <felixsinger@posteo.net>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/60651
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Sean Rhodes <sean@starlabs.systems>

src/mainboard/google/kahlee/variants/baseboard/include/baseboard/acpi/thermal.asl

@@ -23,7 +23,7 @@ Scope (\_TZ)
 		/* Convert from Degrees C to 1/10 Kelvin for ACPI */
 		Method (CTOK, 1) {
 			/* 10th of Degrees C */
-			Multiply (Arg0, 10, Local0)
+			Local0 = Arg0 * 10
 
 			/* Convert to Kelvin */
 			Local0 += 2732