tty: serial: imx: disable the break condition when shutdown the uart port

The comment in imx_uart_shutdown() says to disable the break condition,
but it doesn't actually do that, here fix this by disabling UCR1_SNDBRK
when closing the uart port like other uart drivers do.
Signed-off-by: Sherry Sun <sherry.sun@nxp.com>
Link: https://lore.kernel.org/r/20221214031137.28815-4-sherry.sun@nxp.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/imx.c

@@ -1564,7 +1564,8 @@ static void imx_uart_shutdown(struct uart_port *port)
 	spin_lock_irqsave(&sport->port.lock, flags);
 
 	ucr1 = imx_uart_readl(sport, UCR1);
-	ucr1 &= ~(UCR1_TRDYEN | UCR1_RRDYEN | UCR1_RTSDEN | UCR1_RXDMAEN | UCR1_ATDMAEN);
+	ucr1 &= ~(UCR1_TRDYEN | UCR1_RRDYEN | UCR1_RTSDEN | UCR1_RXDMAEN |
+		  UCR1_ATDMAEN | UCR1_SNDBRK);
 	/* See SER_RS485_ENABLED/UTS_LOOP comment in imx_uart_probe() */
 	if (port->rs485.flags & SER_RS485_ENABLED &&
 	    port->rs485.flags & SER_RS485_RTS_ON_SEND &&