arm64: dts: exynos: Add compatibles to sysreg nodes

System register nodes, implementing syscon binding, should use
appropriate compatible.  This fixes dtbs_check warnings:

  arch/arm64/boot/dts/exynos/exynos5433-tm2.dt.yaml: syscon@13b80000:
    compatible: ['syscon'] is not valid under any of the given schemas

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Reviewed-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Link: https://lore.kernel.org/r/20200829142501.31478-8-krzk@kernel.org
diff --git a/arch/arm64/boot/dts/exynos/exynos5433.dtsi b/arch/arm64/boot/dts/exynos/exynos5433.dtsi
index 74ac4ac..b2eebdd 100644
--- a/arch/arm64/boot/dts/exynos/exynos5433.dtsi
+++ b/arch/arm64/boot/dts/exynos/exynos5433.dtsi
@@ -1015,17 +1015,17 @@ hdmiphy: hdmiphy@13af0000 {
 		};
 
 		syscon_disp: syscon@13b80000 {
-			compatible = "syscon";
+			compatible = "samsung,exynos5433-sysreg", "syscon";
 			reg = <0x13b80000 0x1010>;
 		};
 
 		syscon_cam0: syscon@120f0000 {
-			compatible = "syscon";
+			compatible = "samsung,exynos5433-sysreg", "syscon";
 			reg = <0x120f0000 0x1020>;
 		};
 
 		syscon_cam1: syscon@145f0000 {
-			compatible = "syscon";
+			compatible = "samsung,exynos5433-sysreg", "syscon";
 			reg = <0x145f0000 0x1038>;
 		};