rockchip: rk3288-firefly: Migrate to OF_UPSTREAM

The device tree for Firefly-RK3288 in dts/upstream can be used as-is by
U-Boot, migrate board to use OF_UPSTREAM.

Add chosen stdout-path prop to board u-boot.dtsi as it is missing in DT
from dts/upstream. Also change to use the upstream power_led symbol.

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
6 files changed