dt-bindings: gpu: mali-midgard: Add samsung exynos5250 compatible

Add "samsung,exynos5250-mali" binding.
Signed-off-by: Guillaume Gardet <guillaume.gardet@arm.com>

Cc: Kukjin Kim <kgene@kernel.org>
Cc: Krzysztof Kozlowski <krzk@kernel.org>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: devicetree@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Rob Herring <robh@kernel.org>

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

@@ -30,12 +30,15 @@ properties:
           - enum:
              - rockchip,rk3399-mali
           - const: arm,mali-t860
+      - items:
+          - enum:
+             - samsung,exynos5250-mali
+          - const: arm,mali-t604
       - items:
           - enum:
              - samsung,exynos5433-mali
           - const: arm,mali-t760
 
-          # "arm,mali-t604"
           # "arm,mali-t624"
           # "arm,mali-t628"
           # "arm,mali-t830"