[PATCH] imx: imx8qxp_mek: update README

[sbabic at denx.de]

> Update README to use 4.19.35_1.1.0 released firmware images.
> Signed-off-by: Peng Fan <peng.fan at nxp.com>
Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

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