asus/p2b-ls: Disable SuperI/O ACPI logical device

This logical device is disabled in OEM BIOS. Disable here to match,
since its support is currently incomplete anyway.

Change-Id: I5c07136ec6a14a8ee8cb68537a2663b78fc0fa20
Signed-off-by: Keith Hui <buurin@gmail.com>
Reviewed-on: https://review.coreboot.org/22145
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Marc Jones <marc@marcjonesconsulting.com>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

src/mainboard/asus/p2b-ls/devicetree.cb

@@ -37,7 +37,7 @@ chip northbridge/intel/i440bx		# Northbridge
           end
           device pnp 3f0.8 on		# GPIO 2
           end
-          device pnp 3f0.a on		# ACPI
+          device pnp 3f0.a off		# ACPI
           end
         end
       end