[U-Boot] armv8: fsl-layerscape: Fix SECURE_BOOT config

[york sun]

On 01/04/2017 10:32 AM, York Sun wrote:
> Without a prompt in Kconfig, SECURE_BOOT cannot be selected by
> defconfig. The option was dropped unintentionally when defconfig
> files were cleaned up. Three targets were impacted
> ls1043ardb_SECURE_BOOT, ls2080ardb_SECURE_BOOT,
> ls2080aqds_SECURE_BOOT.
>
> Signed-off-by: York Sun <york.sun at nxp.com>
> Reviewed-by: Simon Glass <sjg at chromium.org>
> ---

Applied to fsl-qoriq master, awaiting upstream.

York