ec/lenovo/h8: Implement thinkpad-acpi compatible LED function

Change-Id: I9998b0b4a1413ab65f1dbdf59b2f84d331ce9c3d
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/6790
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>

src/ec/lenovo/h8/acpi/ec.asl

@@ -75,6 +75,12 @@ Device(EC)
 		Store(Arg0, LEDS)
 	}
 
+	/* Not used for coreboot. Provided for compatibility with thinkpad-acpi.  */
+	Method (LED, 2, NotSerialized)
+	{
+		TLED(Or(Arg0, Arg1))
+	}
+
 	Method (_INI, 0, NotSerialized)
 	{
 	}