staging: comedi: cb_pcidda: cleanup the analog output range

All the boards supported by this driver have the same analog output
ranges. Remove the 'range' from the boardinfo and just use the
'cb_pcidda_ranges' directly when initializing the subdevice.

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>