ARM: dts: exynos: Remove empty camera pinctrl configuration in Universal C210

The camera's pinctrl configuration is simply empty and not effective.
Remove it to fix dtbs_check warning:

  arch/arm/boot/dts/exynos4210-universal_c210.dt.yaml: camera: pinctrl-0: True is not of type 'array'

Link: https://lore.kernel.org/r/20230207210020.677007-2-krzysztof.kozlowski@linaro.org


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