[U-Boot] [U-Boot, 4/6] doc: imx: habv4: Add Secure Boot guide for i.MX6 and i.MX7 SPL targets

[sbabic at denx.de]

> The current U-Boot implementation includes SPL targets for
> some NXP development boards:
> - mx6sabreauto_defconfig
> - mx6sabresd_defconfig
> - mx6ul_14x14_evk_defconfig
> - mx6ul_9x9_evk_defconfig
> Add additional steps needed to completly secure the
> bootloader image.
> Signed-off-by: Breno Lima <breno.lima at nxp.com>

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

Best regards,
Stefano Babic

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