[PATCH V2] imx8mm_beacon/imx8mn_beacon: Update build instructions

[sbabic at denx.de]

> With binman generating flash.bin, it's not longer necessary to
> specify either the location of ATF nor is it necessary to
> specify building flash.bin, so let's update the build instructions
> to remove those.  While in here, update the revision of ATF and
> DDR firmware so both Mini and Nano reference the same revision.
> Signed-off-by: Adam Ford <aford173 at gmail.com>
> Reviewed-by: Fabio Estevam <festevam at gmail.com>
Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

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