Staging: comedi: add ni_daq_dio24 driver

Driver for National Instruments PCMCIA DAQ-Card DIO-24

From: Daniel Vecino Castel <dvecino@able.es>
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>