dt-bindings: arm: rockchip: add initial rk3588 boards

Add DT binding documentation for the Rockchip RK3588 EVB1,
Radxa Rock 5 Model A and B.
Co-Developed-by: Christopher Obbard <chris.obbard@collabora.com>
Signed-off-by: Christopher Obbard <chris.obbard@collabora.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Reviewed-by: Jagan Teki <jagan@edgeble.ai>
Link: https://lore.kernel.org/r/20230109155801.51642-5-sebastian.reichel@collabora.comSigned-off-by: Heiko Stuebner <heiko@sntech.de>

Documentation/devicetree/bindings/arm/rockchip.yaml

@@ -669,6 +669,16 @@ properties:
           - const: radxa,rock3a
           - const: rockchip,rk3568
 
+      - description: Radxa ROCK 5 Model A
+        items:
+          - const: radxa,rock-5a
+          - const: rockchip,rk3588s
+
+      - description: Radxa ROCK 5 Model B
+        items:
+          - const: radxa,rock-5b
+          - const: rockchip,rk3588
+
       - description: Rikomagic MK808 v1
         items:
           - const: rikomagic,mk808
@@ -753,6 +763,11 @@ properties:
           - const: rockchip,rk3399-sapphire-excavator
           - const: rockchip,rk3399
 
+      - description: Rockchip RK3588 Evaluation board
+        items:
+          - const: rockchip,rk3588-evb1-v10
+          - const: rockchip,rk3588
+
       - description: Rockchip RV1108 Evaluation board
         items:
           - const: rockchip,rv1108-evb