dt-bindings: usb: ti,tps6598x: Disallow undefined properties

Device specific bindings should not allow undefined properties. This is
accomplished in json-schema with 'additionalProperties: false'. With this,
the 'connector' child node needs to be defined to prevent warnings.

Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://lore.kernel.org/r/20231016155527.2973385-1-robh@kernel.org


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