staging: comedi: amplc_dio200: tidy up {comedi, pci}_driver declarations

For aesthetics, add some whitespace to these declarations.
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>