Driver core: convert tty core to use struct device

Converts from using struct "class_device" to "struct device" making
everything show up properly in /sys/devices/ with symlinks from the
/sys/class directory.

Also fixes up the isdn drivers that were putting something in the class
device's directory.

Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/include/linux/tty.h b/include/linux/tty.h
index 44091c0..65321f91 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -276,9 +276,8 @@
 extern int tty_unregister_ldisc(int disc);
 extern int tty_register_driver(struct tty_driver *driver);
 extern int tty_unregister_driver(struct tty_driver *driver);
-extern struct class_device *tty_register_device(struct tty_driver *driver,
-						unsigned index,
-						struct device *dev);
+extern struct device *tty_register_device(struct tty_driver *driver,
+					  unsigned index, struct device *dev);
 extern void tty_unregister_device(struct tty_driver *driver, unsigned index);
 extern int tty_read_raw_data(struct tty_struct *tty, unsigned char *bufp,
 			     int buflen);