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Adds serdev_device_break_ctl() and an implementation for ttyport. This function simply calls the break_ctl in tty layer, which can assert a break signal over UART-TX line, if the tty and the underlying platform and UART peripheral supports this operation. Signed-off-by: Neeraj Sanjay Kale <[email protected]> Reviewed-by: Simon Horman <[email protected]> Signed-off-by: Luiz Augusto von Dentz <[email protected]>