Staging: comedi: Add a module parameter 'comedi_autoconfig'.

Set it to 0 or 'N' to disable autoconfiguration.
It is enabled by default.

From: Ian Abbott <abbotti@mev.co.uk>
Cc: Frank Mori Hess <fmhess@users.sourceforge.net>
Cc: David Schleef <ds@schleef.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>