staging: comedi: remove COMEDI_DEVICE_CREATE macro, expand all callers

This is no longer needed as the code is now in the main kernel tree.

Signed-off-by: Pavel Roskin <proski@gnu.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>