Bluetooth: Convert hdev->ssp_mode to a flag

The ssp_mode is essentially just a boolean so it's more appropriate to
have it simply as a flag in hdev->dev_flags.

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

include/net/bluetooth/hci.h

@@ -94,6 +94,7 @@ enum {
 	HCI_DEBUG_KEYS,
 
 	HCI_LE_SCAN,
+	HCI_SSP_ENABLED,
 };
 
 /* HCI ioctl defines */