dt-bindings: rockchip: Add Hardkernel ODROID-M1 board

Add device tree binding for Hardkernel ODROID-M1 board based on RK3568
SoC.
Signed-off-by: Dongjin Kim <tobetter@gmail.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Tested-by: Dan Johansen <strit@manjaro.org>
Link: https://lore.kernel.org/r/20220930051246.391614-2-aurelien@aurel32.netSigned-off-by: Heiko Stuebner <heiko@sntech.de>

Documentation/devicetree/bindings/arm/rockchip.yaml

@@ -468,6 +468,11 @@ properties:
           - const: hardkernel,rk3326-odroid-go2
           - const: rockchip,rk3326
 
+      - description: Hardkernel Odroid M1
+        items:
+          - const: rockchip,rk3568-odroid-m1
+          - const: rockchip,rk3568
+
       - description: Hugsun X99 TV Box
         items:
           - const: hugsun,x99