Staging: comedi: add adq12b driver

driver for MicroAxial ADQ12-B data acquisition and control card

From: Jeremy Theler <thelerg@ib.cnea.gov.ar>
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>