[U-Boot] [U-Boot, 3/3] rockchip: rk3399: enable preboot for boot mode detect

[Philipp Tomsich]

> We need to get into preboot once we detect that we are not
> get into normal boot.
> 
> Signed-off-by: Kever Yang <kever.yang at rock-chips.com>
> Reviewed-by: Simon Glass <sjg at chromium.org>
> ---
> 
>  include/configs/rk3399_common.h | 2 ++
>  1 file changed, 2 insertions(+)
> 

Acked-by: Philipp Tomsich <philipp.tomsich at theobroma-systems.com>