[U-Boot] [U-Boot,5/6] doc: imx: habv4: Move encrypted boot guide

[sbabic at denx.de]

> All guides are currently located at doc/imx/habv4/guides/ directory.
> Move encrypted_boot.txt document to guides directory.
> 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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