[PATCH] imx: Suggest the NXP ATF github repo

[sbabic at denx.de]

> As explained in the text at the bottom of the page 
> https://source.codeaurora.org/external/imx/imx-atf:
> "QUIC repositories on this site will not receive any updates after
> March 31, 2022, and will be deleted on March 31, 2023."
> Point to the NXP ATF github repo instead.
> Signed-off-by: Fabio Estevam <festevam at denx.de>
> Reviewed-by: Oliver Graute <oliver.graute at kococonnector.com>
> Reviewed-by: Marcel Ziswiler <marcel.ziswiler at toradex.com>
> Reviewed-by: Frieder Schrempf <frieder.schrempf at kontron.de>
Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

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