[PATCH v3] doc: add board documentation for stm32mp1

[Patrick DELAUNAY]

Hi,

> From: Patrick DELAUNAY <patrick.delaunay at st.com>
> Sent: mardi 25 février 2020 19:04
> 
> Change plain test README to rst format and move this file in documentation
> directory.
> 
> Signed-off-by: Patrick Delaunay <patrick.delaunay at st.com>
> Tested-by: Heinrich Schuchardt <xypron.glpk at gmx.de>
> Reviewed-by: Patrice Chotard <patrice.chotard at st.com>
> ---

Applied to u-boot-stm32/master, thanks!

Regards
Patrick