dt-bindings: soundwire: Add reference to soundwire-controller.yaml schema

The soundwire-controller.yaml schema already defines the form for devices
in child nodes, so there's no need to do the same

dt-bindings: soundwire: Add reference to soundwire-controller.yaml schema

The soundwire-controller.yaml schema already defines the form for devices
in child nodes, so there's no need to do the same in the QCom controller
binding. Add a $ref to the soundwire-controller.yaml schema and drop the
child node schema.

Reviewed-by: Krzysztof Kozlowski <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Rob Herring <[email protected]>

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