board: sama5d2_xplained: Enable an early debug UART
Enable an early debug UART to debug problems when an ICE or other debug mechanism is not available. Signed-off-by: NWenyou Yang <wenyou.yang@atmel.com> Reviewed-by: NSimon Glass <sjg@chromium.org> Reviewed-by: NAndreas Bießmann <andreas.devel@googlemail.com>
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