arm: wandboard: move CONFIG_MXC_UART to defconfig
For using a debug UART on the Wandboard CONFIG_MXC_UART=y must be set in the .config file. To avoid duplicate definitions move the setting from include/configs/wandboard.h to configs/wandboard_defconfig. Document the debug UART settings in the README. Signed-off-by: NHeinrich Schuchardt <xypron.glpk@gmx.de> Reviewed-by: NFabio Estevam <festevam@gmail.com>
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