[PATCH V3] board: bsh: imx8mn_bsh_smm_s2/s2pro: enable DM_SERIAL

[sbabic at denx.de]

> Enable DM_SERIAL for both U_Boot and the SPL. The uart4 and its pinmux
> are already marked with u-boot,dm-spl but we need to move the call to
> preloader_console_init() after spl_init() to avoid a board hang
> as dm can't be used until after spl_init().
> Remove the manual config of the UART pinmux now that it is no longer
> needed.
> Signed-off-by: Michael Trimarchi <michael at amarulasolutions.com>
> Cc: Tim Harvey <tharvey at gateworks.com>
> Reviewed-by: Fabio Estevam <festevam at denx.de>
> Tested-by: Ariel D'Alessandro <ariel.dalessandro at collabora.com>
Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

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