ARM: dts: s5pv210: drop simple-bus from FIMC

The FIMC camera node wrapper is not a bus, so using simple-bus fallback
compatible just to instantiate its children nodes was never correct.

The change is not backwards compatible and expects the FIMC driver to
populate its children.

Link: https://lore.kernel.org/r/20230207193254.550236-2-krzysztof.kozlowski@linaro.org


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