dt-bindings: arm: rockchip: Add Radxa CM5 IO board

Add device tree binding for the Radxa CM5 IO board.

This board is based on the rk3588s.

Signed-off-by: Joseph Kogut <joseph.kogut@gmail.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: FUKAUMI Naoki <naoki@radxa.com>
Link: https://patch.msgid.link/20251205120703.14721-2-naoki@radxa.com
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

Author: jakogut

Documentation/devicetree/bindings/arm/rockchip.yaml

@@ -907,6 +907,13 @@ properties:
           - const: radxa,cm3
           - const: rockchip,rk3566
 
+      - description: Radxa Compute Module 5 (CM5)
+        items:
+          - enum:
+              - radxa,cm5-io
+          - const: radxa,cm5
+          - const: rockchip,rk3588s
+
       - description: Radxa CM3 Industrial
         items:
           - enum: