staging: comedi: adv_pci1710: simplify digital input and output boardinfo
staging: comedi: adv_pci1710: simplify digital input and output boardinfo

The boards that have digital inputs and outputs always have 16 input channels and
16 output channels.

Replace the 'n_dichan' and 'n_dochan' members of the boardinfo with the fit-field
flag 'has_di_do' and refactor the board attach accordingly.

Remove the unnecessary initialization of the subdevice 'len_chanlist'. That
member is only used by subdevices that support async commands.

Signed-off-by: H Hartley Sweeten <382ff55d8e07d1082d179e669636cd1552da4f36@visionengravers.com>
Reviewed-by: Ian Abbott <9e6ba6483b6a3e14d61f7c987e72ecb5b46122d6@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <4645f7897fd33786a2ee1264d590b3c400559d85@linuxfoundation.org>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs