[PATCH 3/3] imx: hab: Explain that ivt_offset is optional

[sbabic at denx.de]

> From: Fabio Estevam <festevam at denx.de>
> The ivt_offset parameter is optional for both hab_auth_img_or_fail
> and hab_auth_img commands.
> Document it in their usage texts to make it clearer.
> Signed-off-by: Fabio Estevam <festevam at denx.de>
Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

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