ARM: dts: rockchip: Add rv1126 uart5m2_xfer pins

Add uart5m2_xfer pins for Rockchip RV1126 uart5.

Signed-off-by: Jagan Teki <jagan@edgeble.ai>
Link: https://lore.kernel.org/r/20230731103518.2906147-9-jagan@edgeble.ai


Signed-off-by: Heiko Stuebner <heiko@sntech.de>