ARM: dts: exynos: Use Exynos5422 compatible for the DSI controller

The driver adding support for Exynos5422/Exynos5800 DSI controller was
merged in 2016, yet it wasn't actually used. Add a proper compatible
for it.

Signed-off-by: Markuss Broks <markuss.broks@gmail.com>
Link: https://lore.kernel.org/r/20230121201844.46872-3-markuss.broks@gmail.com


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