The device tree for ASUS Tinker Board and S variant in dts/upstream can be used as-is by U-Boot, migrate board to OF_UPSTREAM. The change to use DT from dts/upstream will include minor changes and fixes related to leds and regulators. Signed-off-by: Jonas Karlman <jonas@kwiboo.se> Reviewed-by: Kever Yang <kever.yang@rock-chips.com>