dt-bindings: pinctrl: Add rk3562 pinctrl support

Add the compatible string for the rk3562 SoC.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Link: https://lore.kernel.org/20241224093522.3815562-1-kever.yang@rock-chips.com


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