[PATCH] imx: Kconfig: enable IMX_BOOTAUX for i.MX8M

[sbabic at denx.de]

> i.MX8M could use imx bootaux to boot m4/m7 core, so let's add it
> to the dependency list.
> Signed-off-by: Peng Fan <peng.fan at nxp.com>
Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

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