ARM: dts: exynos: Use Exynos5420 compatible for the MIPI video phy

For some reason, the driver adding support for Exynos5420 MIPI phy
back in 2016 wasn't used on Exynos5420, which caused a kernel panic.
Add the proper compatible for it.
Signed-off-by: Markuss Broks <markuss.broks@gmail.com>
Link: https://lore.kernel.org/r/20230121201844.46872-2-markuss.broks@gmail.comSigned-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

arch/arm/boot/dts/exynos5420.dtsi

@@ -592,7 +592,7 @@ dp_phy: dp-video-phy {
 		};
 
 		mipi_phy: mipi-video-phy {
-			compatible = "samsung,s5pv210-mipi-video-phy";
+			compatible = "samsung,exynos5420-mipi-video-phy";
 			syscon = <&pmu_system_controller>;
 			#phy-cells = <1>;
 		};