tree: Replace ShiftLeft(a,b) with ASL 2.0 syntax

Replace `ShiftLeft (a, b)` with `a << b`.

Change-Id: I812b1ed9dcf3a5749b39a9beb9f870258ad6a0de
Signed-off-by: Felix Singer <felixsinger@posteo.net>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/70842
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/ec/google/chromeec/acpi/ec.asl

@@ -621,7 +621,7 @@ Device (EC0)
 	 */
 	Method (UPPS, 1, Serialized)
 	{
-		Or (USPP, ShiftLeft (1, Arg0), USPP)
+		Or (USPP, 1 << Arg0, USPP)
 	}
 
 	/*
@@ -630,7 +630,7 @@ Device (EC0)
 	 */
 	Method (UPPC, 1, Serialized)
 	{
-		And (USPP, Not (ShiftLeft (1, Arg0)), USPP)
+		And (USPP, Not (1 << Arg0), USPP)
 	}
 #endif