[U-Boot] [U-Boot,2/6] doc: imx: habv4: Add HABv4 introduction

[sbabic at denx.de]

> The HABv4 is supported in i.MX50, i.MX53, i.MX6, i.MX7,
> series and i.MX 8M, i.MX8MM devices.
> Add an introductory document containing the following topics:
> - HABv4 Introduction
> - HABv4 Secure Boot
> - HABv4 Encrypted Boot
> - HAB PKI tree generation
> - HAB Fast Authentication PKI tree generation
> - SRK Table and SRK Hash generation
> Reviewed-by: Ye Li <ye.li at nxp.com>
> Reviewed-by: Utkarsh Gupta <utkarsh.gupta at nxp.com>
> 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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