[PATCH] imx8m: Drop unused function env_get_offset

[sbabic at denx.de]

> This function is used in nxp u-boot tree.
> Signed-off-by: Michael Trimarchi <michael at amarulasolutions.com>
> Reviewed-by: Fabio Estevam <festevam at gmail.com>
Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

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