Staging: comedi: add cb_pcidas driver

For MeasurementComputing PCI-DAS series with the AMCC S5933 PCI
controller

From: Ivan Martinez <imr@oersted.dtu.dk>
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>