dt-bindings: usb: add ON Semiconductor nb7vpq904m Type-C Linear Redriver bindings

Document bindings for this ON Semiconductor Type-C USB SuperSpeed
and DisplayPort ALT Mode Linear Redriver.

Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Message-ID: <20230601-topic-sm8x50-upstream-redriver-v3-1-988c560e2195@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>