staging: comedi: drivers: comedi_bond.c: Remove unneeded #define

Remove unneeded #define. This was previously included in a patch set
two but patchset one was taken by mistake.

Signed-off-by: Rickard Strandqvist <rickard_strandqvist@spectrumdigital.se>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>