[PATCH] warp7: Remove duplicated "mmc dev" command

[sbabic at denx.de]

> From: Fabio Estevam <festevam at denx.de>
> The "mmc dev ${mmcdev}" command is done twice.
> Remove one ocurrence to avoid the duplication.
> Signed-off-by: Fabio Estevam <festevam at denx.de>
Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

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