Don't use Amstrad Delta custom I/O functions any longer, use GPIO API
instead.
Signed-off-by: NJanusz Krzysztofik <jkrzyszt@tis.icnet.pl>
Acked-by: NTomi Valkeinen <tomi.valkeinen@ti.com>
Signed-off-by: NTony Lindgren <tony@atomide.com>