media: ipu3-cio2: Convert to use software_node_register_node_group()

The currently used software_node_register_nodes() is going to
be removed. Prepare driver by switching to a new API.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Tested-by: Daniel Scally <dan.scally@ideasonboard.com>
Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Reviewed-by: Daniel Scally <dan.scally@ideasonboard.com>
Link: https://lore.kernel.org/r/20221228094922.84119-3-andriy.shevchenko@linux.intel.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>