[U-Boot] [PATCH 4/4] imx: configs: Cleanup CONFIG_SECURE_BOOT comments

[sbabic at denx.de]

> Since commit 6e1f4d2652e7 ("arm: imx-common: add SECURE_BOOT option
> to Kconfig") the SECURE_BOOT option is selected through Kconfig.
> Cleanup comments in code to align with this change.
> Signed-off-by: Breno Lima <breno.lima at nxp.com>
> Reviewed-by: Fabio Estevam <festevam at gmail.com>

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

Best regards,
Stefano Babic

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