dt-bindings: remoteproc: xlnx,zynqmp-r5fss: Add missing "additionalProperties" on child nodes

All nodes need an explicit additionalProperties or unevaluatedProperties
unless a $ref has one that's false.  Add missing additionalProperties
to fix dt_binding_check warning:

  xlnx,zynqmp-r5fss.yaml: ^r(.*)@[0-9a-f]+$: Missing additionalProperties/unevaluatedProperties constraint

Fixes: 9e1b2a07 ("dt-bindings: remoteproc: Add Tightly Coupled Memory (TCM) bindings")
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Tanmay Shah <tanmay.shah@amd.com>
Link: https://lore.kernel.org/r/20240811153438.126457-1-krzysztof.kozlowski@linaro.org


Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>