[PATCH v3 1/4] imxrt1050-evk: README: change dd command destination

[sbabic at denx.de]

> Set dd "of=" to "of=/dev/sdX" to be generic and prevent host hard drive
> damage.
> Signed-off-by: Giulio Benetti <giulio.benetti at benettiengineering.com>
Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

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