dt-bindings: gpu: mali: Add Samsung compatibles for Midgard and Utgard

Add vendor compatibles for specific implementation of Mali Utgard
(Exynos3250, Exynos4-family) and Midgard (Exynos5433, Exynos7).
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>

Documentation/devicetree/bindings/gpu/arm,mali-midgard.txt

@@ -16,6 +16,7 @@ Required properties:
     + "arm,mali-t880"
   * which must be preceded by one of the following vendor specifics:
     + "amlogic,meson-gxm-mali"
+    + "samsung,exynos5433-mali"
     + "rockchip,rk3288-mali"
     + "rockchip,rk3399-mali"
 

Documentation/devicetree/bindings/gpu/arm,mali-utgard.txt

@@ -17,6 +17,7 @@ Required properties:
       + amlogic,meson8b-mali
       + amlogic,meson-gxbb-mali
       + amlogic,meson-gxl-mali
+      + samsung,exynos4210-mali
       + rockchip,rk3036-mali
       + rockchip,rk3066-mali
       + rockchip,rk3188-mali