dm: serial: Move baud rate calculation to ns16550.c
Move the function that calculates the baud rate divisor into ns16550.c so
it can be used by that file.
Signed-off-by: NSimon Glass <sjg@chromium.org>
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Move the function that calculates the baud rate divisor into ns16550.c so
it can be used by that file.
Signed-off-by: NSimon Glass <sjg@chromium.org>