Bluetooth: mgmt: Implement Set LE command

This patch implements support for the Set LE mgmt command. Now, in
addition to the enable_le module parameter user space needs to send an
explicit Enable LE command to enable LE support.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Acked-by: Marcel Holtmann <marcel@holtmann.org>

include/net/bluetooth/hci.h

@@ -96,6 +96,7 @@ enum {
 	HCI_LE_SCAN,
 	HCI_SSP_ENABLED,
 	HCI_HS_ENABLED,
+	HCI_LE_ENABLED,
 	HCI_CONNECTABLE,
 	HCI_DISCOVERABLE,
 	HCI_LINK_SECURITY,