dt-bindings: arm: rockchip: Add Orange Pi 5 board

Add Orange Pi 5 SBC from Xunlong.
Signed-off-by: Muhammed Efe Cetin <efectn@6tel.net>
Reviewed-by: Dhruva Gole <d-gole@ti.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/89e92c8df546a0b926ba7481aa83c1945e81e8a4.1696878787.git.efectn@6tel.netSigned-off-by: Heiko Stuebner <heiko@sntech.de>

Documentation/devicetree/bindings/arm/rockchip.yaml

@@ -877,6 +877,11 @@ properties:
               - xunlong,orangepi-r1-plus-lts
           - const: rockchip,rk3328
 
+      - description: Xunlong Orange Pi 5
+        items:
+          - const: xunlong,orangepi-5
+          - const: rockchip,rk3588s
+
       - description: Zkmagic A95X Z2
         items:
           - const: zkmagic,a95x-z2