mainboard/*/acpi/superio.asl: Use non-local inclusion syntax

Use non-local inclusion syntax over relative paths for
'drivers/pc80/ps2_controller.asl'.

Change-Id: Ie2bfa893dc268ec5118d2a9addadbc759d85d357
Signed-off-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-on: http://review.coreboot.org/7664
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Tested-by: build bot (Jenkins)
7 files changed