Bluetooth: hci-uart-ath: Correct the comments in this driver

Correct the comments in this driver. Set the CRTSCTS flag means
automatic flow control is enabled.
Signed-off-by: Fugang Duan <B38611@freescale.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

drivers/bluetooth/hci_ath.c

@@ -74,7 +74,7 @@ static int ath_wakeup_ar3k(struct tty_struct *tty)
 
 	status = tty->driver->ops->tiocmget(tty);
 
-	/* Disable Automatic RTSCTS */
+	/* Enable Automatic RTSCTS */
 	ktermios.c_cflag |= CRTSCTS;
 	status = tty_set_termios(tty, &ktermios);