rockchip: rk3288-tinker: Migrate to OF_UPSTREAM

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>
7 files changed