[U-Boot] Revert "tools: imx8image: set dcd_skip to true"

[sbabic at denx.de]

> This reverts commit f7e475db4011d18b4ae974154eb022c3af6a4d16.
> This commit breaks the boot on imx8qxp evk and it should only
> be re-applied after imx8qxp evk is converted to SPL.
> Revert it for now, so that imx8qxp evk can be functional.
> Reported-by: Breno Lima <breno.lima at nxp.com>
> Signed-off-by: Fabio Estevam <festevam at gmail.com>
> Reviewed-by: Peng Fan <peng.fan at nxp.com>
> Tested-by: Breno Lima <breno.lima at nxp.com>

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

Best regards,
Stefano Babic

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