staging: comedi: adv_pci_dio: update for PCI-1761

Advantech PCI-1761 device support to the driver adv_pci_dio has been
added. Patch has been successfully tested on a real card (8 digital
outs, 8 digital inputs).

Signed-off-by: Anton Dozenko <anton.dozenko@gmail.com>
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>