Staging: comedi: add pcl724 driver

For Advantech cards:
	PCL-724, PCL-722, PCL-731 ADLink ACL-7122, ACL-7124, PET-48DIO

From: Michal Dobes <dobes@tesnet.cz>
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>