[U-Boot] [U-Boot,12/13] mx53ppd: fix unsupported set command

[sbabic at denx.de]

> Fix the NFS commands which used `set' to instead use `setenv'.
> Signed-off-by: Ian Ray <ian.ray at ge.com>

Applied to u-boot-imx, -next, thanks !

Best regards,
Stefano Babic

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