dt-bindings: pinctrl: add rockchip,rk3036-pinctrl compatible string

Add the compatible string "rockchip,rk3036-pinctrl" in already
in use in rk3036.dtsi to rockchip,pinctrl.yaml.
Signed-off-by: Johan Jonker <jbx6244@gmail.com>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220330133952.1949-1-jbx6244@gmail.comSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

Documentation/devicetree/bindings/pinctrl/rockchip,pinctrl.yaml

@@ -33,6 +33,7 @@ properties:
     enum:
       - rockchip,px30-pinctrl
       - rockchip,rk2928-pinctrl
+      - rockchip,rk3036-pinctrl
       - rockchip,rk3066a-pinctrl
       - rockchip,rk3066b-pinctrl
       - rockchip,rk3128-pinctrl