dt-bindings: rockchip: pmu: Ensure all properties are defined

Device specific schemas should not allow undefined properties which is
what 'additionalProperties: true' allows. Add the missing child nodes
and fix this constraint.

Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://lore.kernel.org/r/20250203213056.13827-1-robh@kernel.org


Signed-off-by: Heiko Stuebner <heiko@sntech.de>