Staging: ipack/devices/ipoctal: Convert ipoctal to directly use ioread/write functions.

Before it was using the functions in ipack_bus_ops.

Signed-off-by: Jens Taprogge <jens.taprogge@taprogge.org>
Signed-off-by: Samuel Iglesias Gonsálvez <siglesias@igalia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>