staging: comedi: dt282x: remove '= 0' boardinfo

All unlisted members in the boardinfo declaraction will default to '0'.
Remove the unnecessary code.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>