dt-bindings: net: pse-pd: microchip,pd692x0: Fix missing "additionalProperties" constraints

The child nodes are missing "additionalProperties" constraints which
means any undocumented properties or child nodes are allowed. Add the
constraints, and fix the fallout of wrong manager node regex and
missing properties.

Fixes: 9c1de033 ("dt-bindings: net: pse-pd: Add bindings for PD692x0 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/20240523171732.2836880-1-robh@kernel.org


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