ARM: dts: exynos: drop unused samsung,camclk-out property in Midas

The S5K6A3 camera sensor does not use nor allow samsung,camclk-out
property.

Link: https://lore.kernel.org/r/20230211134731.85957-3-krzysztof.kozlowski@linaro.org


Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>