[U-Boot] [PATCH 18/34] imx8mq_evk/README: add missing firmware extract step

[sbabic at denx.de]

> Tested-by: Fabio Estevam <festevam at gmail.com>
> Signed-off-by: Baruch Siach <baruch at tkos.co.il>
> Reviewed-by: Peng Fan <peng.fan at nxp.com>

Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

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