The child nodes are missing "additionalProperties" constraints which
means any undocumented properties or child nodes are allowed. Add the
constraints and all the undocumented properties exposed by the fix.

Fixes: f562202f ("dt-bindings: net: pse-pd: Add bindings for TPS23881 PSE controller")
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Acked-by: Kory Maincent <kory.maincent@bootlin.com>
Link: https://lore.kernel.org/r/20240523171750.2837331-1-robh@kernel.orgSigned-off-by: Jakub Kicinski <kuba@kernel.org>