Enable CONFIG_DM_SERIAL. uart and its pinmux was already marked with u-boot,dm-spl. Move preloader_console_init after spl_early_init to make sure driver model work. Signed-off-by: Peng Fan <peng.fan@nxp.com> Tested-by: Teresa Remmet <t.remmet@phytec.de> Reviewed-by: Fabio Estevam <festevam@denx.de>