ARM: dts: rockchip: Add Rockchip RV1126 pinctrl

Add pinctrl definitions for Rockchip RV1126.

From RK3568 on-wards pinctrl configurations are maintained
in common conf file rockchip-pinconf.dtsi and it is available
in arm64 path (arch/arm64/boot/dts/rockchip/rockchip-pinconf.dtsi).

So, include the same conf file to RV1126 pinctrl from arm64 path.

Signed-off-by: Jagan Teki <jagan@edgeble.ai>
Link: https://lore.kernel.org/r/20221129075424.189655-4-jagan@edgeble.ai
Signed-off-by: Heiko Stuebner <heiko@sntech.de>