mb/google/slippy/acpi: Replace LGreaterEqual(a,b) with ASL 2.0 syntax

Replace `LGreaterEqual(a, b)` with `a >= b`.

Change-Id: I5c16893b9c98f36fd2c210ed301c2ebb65f95368
Signed-off-by: Felix Singer <felixsinger@posteo.net>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/60692
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Sean Rhodes <sean@starlabs.systems>

src/mainboard/google/slippy/acpi/thermal.asl

@@ -102,7 +102,7 @@ Scope (\_TZ)
 			// Critical temperature in deci-kelvin
 			Store (CTOK (\TCRT), Local1)
 
-			If (LGreaterEqual (Local0, Local1)) {
+			If (Local0 >= Local1) {
 				Printf ("CRITICAL TEMPERATURE: %o", Local0)
 
 				// Wait 1 second for EC to re-poll