Mellanox: Add new mlxsw_spectrum firmware 13.2000.2308

The new firmware contains:
* Support for querying port module type (e.g., QSFP, SFP)
* Fix for issue where locally generated packets could not egress the
switch when the egress port is congested with data plane traffic
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Josh Boyer <jwboyer@kernel.org>

WHENCE

@@ -4545,6 +4545,7 @@ File: mellanox/mlxsw_spectrum-13.1703.4.mfa2
 File: mellanox/mlxsw_spectrum-13.1910.622.mfa2
 File: mellanox/mlxsw_spectrum-13.2000.1122.mfa2
 File: mellanox/mlxsw_spectrum-13.2000.1886.mfa2
+File: mellanox/mlxsw_spectrum-13.2000.2308.mfa2
 
 Licence:
  Copyright (c) 2017-2019 Mellanox Technologies, Ltd. All rights reserved.