Staging: comedi: add cb_pcidio driver

Driver for PCI-DIO24H & PCI-DIO48H of ComputerBoards (currently
MeasurementComputing)

From: Yoshiya Matsuzaka <matsuzay@mail.cc.tohoku.ac.jp>
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>