dt-bindings: i2c: i2c-rk3x: Add compatible string for RK3528

Document I2C controllers integrated in RK3528, which are compatible with
the RK3399 variant.

Signed-off-by: Yao Zi <ziyao@disroot.org>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Andi Shyti <andi.shyti@kernel.org>
Link: https://lore.kernel.org/r/20250417120118.17610-4-ziyao@disroot.org
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>

Author: ziyao233

Documentation/devicetree/bindings/i2c/i2c-rk3x.yaml

@@ -37,6 +37,7 @@ properties:
               - rockchip,px30-i2c
               - rockchip,rk3308-i2c
               - rockchip,rk3328-i2c
+              - rockchip,rk3528-i2c
               - rockchip,rk3562-i2c
               - rockchip,rk3568-i2c
               - rockchip,rk3576-i2c