Sonic Zhang 1cd3f2d2c9 serial: bfin_uart: Don't switch baud rate untill the transfer buffer is empty.
set_termios may be invoked before the former data transfer is completed.
Block until the tranfer is done.

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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