dt-bindings: gpu: mali-midgard: Add Realtek RTD1295

Define a compatible string for Realtek RTD1295 SoC family.
Signed-off-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Rob Herring <robh@kernel.org>

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

@@ -25,6 +25,7 @@ properties:
       - items:
           - enum:
              - amlogic,meson-gxm-mali
+             - realtek,rtd1295-mali
           - const: arm,mali-t820
       - items:
           - enum: