[U-Boot] [U-Boot,01/10] lib: add TPL_OF_LIBFDT option for TPL

[Philipp Tomsich]

> TPL may need use libfdt for dt decode, add option for it.
> 
> Signed-off-by: Kever Yang <kever.yang at rock-chips.com>
> Reviewed-by: Simon Glass <sjg at chromium.org>
> Acked-by: Philipp Tomsich <philipp.tomsich at theobroma-systems.com>
> ---
> 
>  lib/Kconfig | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 

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