staging: comedi: serial2002: Set range for digital inputs and outputs

I got an update from the original author of this driver (Anders
Blomdell) to set the range table for digital input and digital output
subdevices.  Apply it.

Cc: Anders Blomdell <anders.blomdell@control.lth.se>
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>