dt-bindings: arm: rockchip: Add EAIDK-610

EAIDK-610 is a rk3399 based board from OPEN AI LAB
and popularly used by university students.

Specification:
- Rockchip RK3399
- LPDDR3 4GB
- TF sd scard slot
- eMMC
- AP6255 for WiFi + BT
- Gigabit ethernet
- HDMI out
- 40 pin header
- USB 2.0 x 2
- USB 3.0 x 1
- USB 3.0 Type-C x 1
- 12V DC Power supply

Signed-off-by: Andy Yan <andyshrk@163.com>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220709103001.2753992-1-andyshrk@163.com
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

Documentation/devicetree/bindings/arm/rockchip.yaml

@@ -470,6 +470,11 @@ properties:
           - const: netxeon,r89
           - const: rockchip,rk3288
 
+      - description: OPEN AI LAB EAIDK-610
+        items:
+          - const: openailab,eaidk-610
+          - const: rockchip,rk3399
+
       - description: Orange Pi RK3399 board
         items:
           - const: rockchip,rk3399-orangepi