Staging: comedi: add dmm32at driver

Driver for Diamond Systems mm32at

From: Perry J. Piplani <perry.j.piplani@nasa.gov>
Cc: Ian Abbott <abbotti@mev.co.uk>
Cc: David Schleef <ds@schleef.org>
Cc: Frank Mori Hess <fmhess@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>