pinctrl: rockchip: Add rv1126 support

Add pinctrl driver for Rockchip RV1126.

Signed-off-by: Jianqun Xu <jay.xu@rock-chips.com>
Signed-off-by: Jagan Teki <jagan@edgeble.ai>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>