staging: comedi: das08_cs: cleanup and remove useless comments

Move the comment about the PCMCIA support and reword it a bit
because of the move.

Remove a number of useless comments.

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>