Mellanox: Add new mlxsw_spectrum firmware xx.2008.1312

Add latest verified version of Mellanox Spectrum-family switch firmware,
for Spectrum-1 (13.2008.1312), Spectrum-2 (29.2008.1312) and
Spectrum-3 (30.2008.1312).

This version contains a fix for 10G speed in some platforms.

Signed-off-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Josh Boyer <jwboyer@kernel.org>

WHENCE

@@ -4966,6 +4966,9 @@ File: mellanox/mlxsw_spectrum3-30.2008.1036.mfa2
 File: mellanox/mlxsw_spectrum-13.2008.1310.mfa2
 File: mellanox/mlxsw_spectrum2-29.2008.1310.mfa2
 File: mellanox/mlxsw_spectrum3-30.2008.1310.mfa2
+File: mellanox/mlxsw_spectrum-13.2008.1312.mfa2
+File: mellanox/mlxsw_spectrum2-29.2008.1312.mfa2
+File: mellanox/mlxsw_spectrum3-30.2008.1312.mfa2
 
 Licence:
  Copyright (c) 2017-2020 Mellanox Technologies, Ltd. All rights reserved.