[PATCH] doc: imx: habv4: Add Secure Boot guide for i.MX8M SPL targets

[sbabic at denx.de]

> Add HABv4 documentation extension for SPL targets covering the
> following topics:
> - How to sign an securely boot an flash.bin container image.
> - How to extend the root of trust for additional boot images.
> - Add SPL and fitImage CSF examples.
> - Add signature generation script example.
> Signed-off-by: Marek Vasut <marex at denx.de>
> Cc: Breno Lima <breno.lima at nxp.com>
> Cc: Fabio Estevam <festevam at denx.de>
> Cc: Heiko Schocher <hs at denx.de>
> Cc: Peng Fan <peng.fan at nxp.com>
> Cc: Stefano Babic <sbabic at denx.de>
> Cc: Utkarsh Gupta <utkarsh.gupta at nxp.com>
> Cc: Ye Li <ye.li at nxp.com>
Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

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