[U-Boot] [RFC PATCH 1/9] doc: Move existing rst files into api sub-directory

[Heinrich Schuchardt]

On 7/16/19 6:42 PM, Bin Meng wrote:
> Currently the Sphinx doc only contains API descriptions of several
> U-Boot subsystems. For future extension, group these existing docs
> into an API sub-directory.
>
> Signed-off-by: Bin Meng <bmeng.cn at gmail.com>

Reviewed-by: Heinrich Schuchardt <xypron.glpk at gmx.de>