staging: comedi: das800: cleanup the cio-das802/16 fifo comments

Cleanup the comments about the cio-das802/16 specific register
defines. This also removes a checkpatch.pl warning about > 80
char lines.

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>