[U-Boot] ddr: imx8m: hide i.MX8M DDR options from device driver entry

[sbabic at denx.de]

> Use one menu to hide the several i.MX8M DDR options from device
> driver entry.
> 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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