[U-Boot] [RFC PATCH 36/44] mkimage: Add -k option to specify key directory

[Marek Vasut]

Dear Simon Glass,

> Keys required for signing images will be in a specific directory. Add a
> -k option to specify that directory.
> 
> Also update the mkimage man page with this information and a clearer list
> of available commands.
> 
> Signed-off-by: Simon Glass <sjg at chromium.org>

Reviewed-by: Marek Vasut <marex at denx.de>

Best regards,
Marek Vasut