ARM: dts: rockchip: Add stdout-path for rk3036 kylin

Add stdout-path to get a uart console when system boot.

Signed-off-by: Andy Yan <andy.yan@rock-chips.com>
Link: https://lore.kernel.org/r/20231218105523.2478315-3-andyshrk@163.com


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