Bluetooth: mgmt: Make Set Link Security callable while powered off

This patch makes it possible to change the Link Security setting while
powered off and have it automatically enabled when powering on a device.
To track the desired state once powered on a new HCI_LINK_SECURITY flag
is added.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
diff --git a/include/net/bluetooth/hci.h b/include/net/bluetooth/hci.h
index 169d2f8..806eb41 100644
--- a/include/net/bluetooth/hci.h
+++ b/include/net/bluetooth/hci.h
@@ -98,6 +98,7 @@
 	HCI_HS_ENABLED,
 	HCI_CONNECTABLE,
 	HCI_DISCOVERABLE,
+	HCI_LINK_SECURITY,
 };
 
 /* HCI ioctl defines */