Bluetooth: mgmt: Allow connectable/discoverable changes in off state

This patch makes it possible to toggle the connectable & discoverable
settings when powered off. Two new hdev->dev_flags flags are added to
track what the scan mode should be when the device is finally powered
on.

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

include/net/bluetooth/hci.h

@@ -96,6 +96,8 @@ enum {
 	HCI_LE_SCAN,
 	HCI_SSP_ENABLED,
 	HCI_HS_ENABLED,
+	HCI_CONNECTABLE,
+	HCI_DISCOVERABLE,
 };
 
 /* HCI ioctl defines */