Bluetooth: remove unused member of hci_dev.

This patch removes core_data member from hci_dev struct as it is unused.
Signed-off-by: NRami Rosen <ramirose@gmail.com>
Acked-by: NMarcel Holtmann <marcel@holtmann.org>
Signed-off-by: NGustavo Padovan <gustavo.padovan@collabora.co.uk>

include/net/bluetooth/hci_core.h

@@ -262,8 +262,6 @@ struct hci_dev {
 
 	struct sk_buff_head	driver_init;
 
-	void			*core_data;
-
 	atomic_t		promisc;
 
 	struct dentry		*debugfs;