imx: drop CONFIG_MXC_UART_BASE

Since these boards has CONFIG_DM_SERIAL and/or CONFIG_SPL_DM_SERIAL,
the legacy macro no need to be defined.

Reviewed-by: Heiko Schocher <hs@denx.de>
Reviewed-by: Fabio Estevam <festevam@denx.de>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Acked-by: Soeren Moch <smoch@web.de>
Acked-by: Tim Harvey <tharvey@gateworks.com>
13 files changed