[PATCH] imx8m: config: convert to bootm_size

[sbabic at denx.de]

> Restrict the memory range available for image processing in the
> "bootm" to 256 MiB so the kernel can access it and FDT or initrd are
> not overwritten on ARM64.
> Signed-off-by: Grygorii Tertychnyi <grygorii.tertychnyi at leica-geosystems.com>
> Cc: Peng Fan <peng.fan at nxp.com>
> Cc: Marek Vasut <marex at denx.de>
> Cc: Andrey Zhizhikin <andrey.zhizhikin at leica-geosystems.com>
> Reviewed-by: Tom Rini <trini at konsulko.com>
Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

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