Staging: comedi: add cb_pcimdas driver

For Measurement Computing PCI Migration series boards

From: Richard Bytheway <mocelet@sucs.org>
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>