staging: comedi: dnya_pci10xx: remove unused fields in the boardinfo

The *_bits information in the boardinfo is not used by the driver.
Remove it.

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>