staging: comedi: cb_das16_cs: cleanup the pcmcia_driver declaration

For aesthetic reasons, add some whitespace to the declaration
of the pcmcia_driver and reorder it a bit.

Also, the symbol 'das16cs_driver' is only referenced in this file,
make it static. This quiets the following sparse warning:

warning: symbol 'das16cs_driver' was not declared. Should it be static?

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Cc: Frank Mori Hess <fmhess@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>