dt-bindings: net: smsc,lan9115: Ensure all properties are defined

Device specific schemas should not allow undefined properties which is
what 'additionalProperties: true' allows. Add a reference to
mc-peripheral-props.yaml which has the additional properties used, and
fix this constraint.

Acked-by: Jakub Kicinski <kuba@kernel.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20250203-dt-lan9115-fix-v1-4-eb35389a7365@kernel.org


Signed-off-by: Rob Herring (Arm) <robh@kernel.org>