dt-bindings: pinctrl: rockchip: add RK3568 SoC support

Add RK3568/RK3566 SoC support to pinctrl.

Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20210410204500.18091-1-ezequiel@collabora.com


Signed-off-by: Linus Walleij <linus.walleij@linaro.org>