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Sometimes it's more convenient to register a set of individual software nodes grouped together. Add couple of functions for that. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Acked-by: Rafael J. Wysocki <rjw@rjwysocki.net> Reviewed-by: Hans de Goede <hdegoede@redhat.com> Tested-by: Hans de Goede <hdegoede@redhat.com> Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>