tty: Move the vt_tty field from the vc_data into the standard tty_port

This takes all the tty references through the expected interface points so
we can refcount them.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/char/keyboard.c b/drivers/char/keyboard.c
index 25be210..a7ca752 100644
--- a/drivers/char/keyboard.c
+++ b/drivers/char/keyboard.c
@@ -299,7 +299,7 @@
  */
 static void put_queue(struct vc_data *vc, int ch)
 {
-	struct tty_struct *tty = vc->vc_tty;
+	struct tty_struct *tty = vc->port.tty;
 
 	if (tty) {
 		tty_insert_flip_char(tty, ch, 0);
@@ -309,7 +309,7 @@
 
 static void puts_queue(struct vc_data *vc, char *cp)
 {
-	struct tty_struct *tty = vc->vc_tty;
+	struct tty_struct *tty = vc->port.tty;
 
 	if (!tty)
 		return;
@@ -485,7 +485,7 @@
 
 static void fn_hold(struct vc_data *vc)
 {
-	struct tty_struct *tty = vc->vc_tty;
+	struct tty_struct *tty = vc->port.tty;
 
 	if (rep || !tty)
 		return;
@@ -563,7 +563,7 @@
 
 static void fn_send_intr(struct vc_data *vc)
 {
-	struct tty_struct *tty = vc->vc_tty;
+	struct tty_struct *tty = vc->port.tty;
 
 	if (!tty)
 		return;
@@ -1162,7 +1162,7 @@
 	struct keyboard_notifier_param param = { .vc = vc, .value = keycode, .down = down };
 	int rc;
 
-	tty = vc->vc_tty;
+	tty = vc->port.tty;
 
 	if (tty && (!tty->driver_data)) {
 		/* No driver data? Strange. Okay we fix it then. */