Staging: comedi: add me4000 driver

This adds the me4000 driver to the comedi staging tree

From: Guenter Gebhardt <g.gebhardt@meilhaus.com>
Cc: David Schleef <ds@schleef.org>
Cc: Frank Mori Hess <fmhess@users.sourceforge.net>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>