Staging: comedi: add acl7225b driver

For Adlink NuDAQ ACL-7225b & compatibles

From: José Luis Sánchez <jsanchezv@teleline.es>
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>