Bluetooth: Clearly distinguish mgmt LTK type from authenticated property

On the mgmt level we have a key type parameter which currently accepts
two possible values: 0x00 for unauthenticated and 0x01 for
authenticated. However, in the internal struct smp_ltk representation we
have an explicit "authenticated" boolean value.

To make this distinction clear, add defines for the possible mgmt values
and do conversion to and from the internal authenticated value.

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

include/net/bluetooth/mgmt.h

@@ -181,6 +181,9 @@ struct mgmt_cp_load_link_keys {
 } __packed;
 #define MGMT_LOAD_LINK_KEYS_SIZE	3
 
+#define MGMT_LTK_UNAUTHENTICATED	0x00
+#define MGMT_LTK_AUTHENTICATED		0x01
+
 struct mgmt_ltk_info {
 	struct mgmt_addr_info addr;
 	__u8	type;