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

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

Change-Id: Ib8719143a5a217173b34931e9c0ef02e9895d0a5
Signed-off-by: Felix Singer <felixsinger@posteo.net>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/60650
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Sean Rhodes <sean@starlabs.systems>

src/mainboard/google/cyan/variants/terra/include/variant/acpi/dptf.asl

@@ -203,7 +203,7 @@ Device (DPTF)
 	/* 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