ARM: dts: exynos: add ports to TC358764 bridge on Arndale

The Toshiba TC358764 bridge binding expect up two ports as it is a
bridge, thus add ports property to encapsulate them.

Link: https://lore.kernel.org/r/20230225160252.18737-2-krzysztof.kozlowski@linaro.org
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>