media: ipu3-cio2: Switch to use SOFTWARE_NODE_REFERENCE()

This is useful to assign software node reference with arguments
in a common way. Switch to use SOFTWARE_NODE_REFERENCE() here.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20210329151207.36619-6-andriy.shevchenko@linux.intel.com


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