[PATCH] board: gateworks: gw_ventana: fix mmc env dev

[sbabic at denx.de]

> Fix the MMC env device for boards with eMMC by adding a
> board_mmc_get_env_dev override to return the boot device as the
> MMC env device.
> Signed-off-by: Tim Harvey <tharvey at gateworks.com>
Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

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