[PATCH v2] imx: imx8mm_evk: remove hdmi fw info from README

[sbabic at denx.de]

> The imx8mm doesn't require the hdmi firmware.
> Update also the fw version.
> Signed-off-by: Flavio Suligoi <f.suligoi at asem.it>
> Reviewed-by: Peng Fan <peng.fan at nxp.com>
Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

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