[U-Boot] [RFC PATCH 7/9] doc: arch: Convert README.mips to reST

[Heinrich Schuchardt]

On 7/16/19 6:42 PM, Bin Meng wrote:
> Convert plain text documentation to reStructuredText format and add
> it to Sphinx TOC tree. No essential content change.
>
> Signed-off-by: Bin Meng <bmeng.cn at gmail.com>

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