staging: comedi: cb_pcimdas: use preferred block comment style

Use the preferred block comment style for the copyright and Comedi
driver description header comments.

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