Staging: comedi: contec_pci_dio: fixed comment blocks coding style issues

Makes the comment blocks start with /* on separate lines, and end
with */ on separate lines as well,
starting with * for each comment lines.

Signed-off-by: Philippe Loctaux <phil@philippeloctaux.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>