[PATCH v2] imx8mq_evk: configs: add/cleanup variables for distro boot

[sbabic at denx.de]

> Add fdt_addr_r fdtfile which used by distro boot, and cleanup legacy
> environment variables.
> Signed-off-by: Andrey Zhizhikin <andrey.zhizhikin at leica-geosystems.com>
Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

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