[PATCH] mx6sabre: Fix boot failure

[sbabic at denx.de]

> CONFIG_SPL_LEGACY_IMAGE_SUPPORT is necessary for mx6sabresd and
> mx6sabreauto, because u-boot is packed as legacy image not FIT.
> However, this config is not set when CONFIG_SPL_LOAD_FIT is enabled.
> Must enable it explicitly, otherwise will fail to boot like below.
> U-Boot SPL 2021.04-rc2 (Feb 20 2021 - 16:43:04 -0800)
> Trying to boot from MMC1
> mmc_load_image_raw_sector: mmc block read error
> SPL: failed to boot from all boot devices
> Signed-off-by: Ye Li <ye.li at nxp.com>
Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

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