rk3399: Don't enable the debug UART if there is no driver
Some boards do not enable SPL_SERIAL so cannot use the debug UART. Add this condition to the code and drop use of the preprocessor while we are here. Signed-off-by:Simon Glass <sjg@chromium.org> Reviewed-by:
Philipp Tomsich <philipp.tomsich@vrull.eu>
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