dt-bindings: usb: usb251xb: correct swap-dx-lanes type to uint32

dt-bindings: usb: usb251xb: correct swap-dx-lanes type to uint32

The "swap-dx-lanes" was never described as uint8 in original TXT
bindings and Linux driver expects uint32.  Fix the type to match Linux
driver expectation.

Fixes: fff61d4ccf3d ("dt-bindings: usb: usb251xb: Convert to YAML schema")
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Marek Vasut <marex@denx.de>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Richard Leitner <richard.leitner@linux.dev>
Link: https://lore.kernel.org/r/20230516083432.18579-1-krzysztof.kozlowski@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>