staging: comedi: contec_pci_dio: remove unused fields in the boardinfo

The model, in_ports, out_ports, and out_boffs information in the
boardinfo is not used by the driver. Remove them.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>