staging/comedi/cb_das16_cs: Convert to module_comedi_pcmcia_driver

This patch removes the boring init/exit functions with the new
module_comedi_pcmcia_driver macro.

Signed-off-by: Peter Huewe <peterhuewe@gmx.de>
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>