of: property: Add fw_devlink support for pse parent

This allows fw_devlink to create device links between consumers of
a PSE and the supplier of the PSE.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Kory Maincent <kory.maincent@bootlin.com>
Link: https://lore.kernel.org/r/20240414-feature_poe-v8-2-e4bf1e860da5@bootlin.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>