staging: comedi: pcl724: tidy up multi-line comments

Tidy up the multi-line comments are the beginning of the file to follow
the CodingStyle.

Cleanup the comedi comment block about the driver to follow the normal
comedi style.

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>