[PATCH 4/5] imx8m: imx8mn-beacon: Migrate README to rst

[sbabic at denx.de]

> Since U-Boot builds HTML documentation, migrate the contents
> of the README file to an rst file which can generate the
> proper outputs.
> Signed-off-by: Adam Ford <aford173 at gmail.com>
Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

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