Staging: comedi: add cb_pcimdda driver

Driver for Measurement Computing PCIM-DDA06-16

From: Calin Culianu <calin@ajvar.org>
Cc: David Schleef <ds@schleef.org>
Cc: Ian Abbott <abbotti@mev.co.uk>
Cc: Frank Mori Hess <fmhess@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>