[PATCH] pico-imx6ul: Convert to CONFIG_DM_SERIAL

[sbabic at denx.de]

> From: Fabio Estevam <festevam at denx.de>
> The conversion to CONFIG_DM_SERIAL is mandatory, so select
> this option.
>     
> Signed-off-by: Fabio Estevam <festevam at denx.de>
Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

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