staging: comedi: cb_pcidda: cleanup the copyright and comedi comments

Reformat the copyright and driver description comments to follow the
preferred block comment style. Reword the driver description to follow
comedi style described in the skel driver.

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