serial: move delta_msr_wait into the tty_port

This is used by various drivers not just serial and can be extracted
as commonality

Signed-off-by: Alan Cox <alan@linux.intel.com>
diff --git a/include/linux/cyclades.h b/include/linux/cyclades.h
index bbebef7..a5049ea 100644
--- a/include/linux/cyclades.h
+++ b/include/linux/cyclades.h
@@ -578,7 +578,6 @@
 	struct cyclades_idle_stats	idle_stats;
 	struct cyclades_icount	icount;
 	struct completion       shutdown_wait;
-	wait_queue_head_t       delta_msr_wait;
 	int throttle;
 };
 
diff --git a/include/linux/hayesesp.h b/include/linux/hayesesp.h
index 940aeb5..92b08cf 100644
--- a/include/linux/hayesesp.h
+++ b/include/linux/hayesesp.h
@@ -96,7 +96,6 @@
 	int			xmit_head;
 	int			xmit_tail;
 	int			xmit_cnt;
-	wait_queue_head_t	delta_msr_wait;
 	wait_queue_head_t	break_wait;
 	struct async_icount	icount;	/* kernel counters for the 4 input interrupts */
 	struct hayes_esp_config config; /* port configuration */
diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index 27767ea..bcafecd 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -349,7 +349,6 @@
 	struct circ_buf		xmit;
 
 	struct tasklet_struct	tlet;
-	wait_queue_head_t	delta_msr_wait;
 	struct uart_port	*uart_port;
 };
 
diff --git a/include/linux/tty.h b/include/linux/tty.h
index 9fdc3d8..0daa8a7 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -203,6 +203,7 @@
 	int			count;		/* Usage count */
 	wait_queue_head_t	open_wait;	/* Open waiters */
 	wait_queue_head_t	close_wait;	/* Close waiters */
+	wait_queue_head_t	delta_msr_wait;	/* Modem status change */
 	unsigned long		flags;		/* TTY flags ASY_*/
 	struct mutex		mutex;		/* Locking */
 	unsigned char		*xmit_buf;	/* Optional buffer */