Staging: comedi: add nt_atmio driver

Hardware driver for NI AT-MIO E series cards
Supports the AT-MIO-16E-2, AT-MIO-16E-10, AT-MIO-16DE-10,
AT-MIO-64E-3, AT-MIO-16XE-50, AT-MIO-16XE-10, AT-AI-16XE-10 cards

From: 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>