Mellanox: Add new mlxsw_spectrum firmware xx.2007.1168

Add latest verified version of Mellanox Spectrum-family switch firmware,
for Spectrum-1 (13.2007.1168), Spectrum-2 (29.2007.1168) and newly also for
Spectrum-3 (30.2007.1168).

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

WHENCE

@@ -4918,6 +4918,9 @@ File: mellanox/mlxsw_spectrum-13.2000.2308.mfa2
 File: mellanox/mlxsw_spectrum2-29.2000.2308.mfa2
 File: mellanox/mlxsw_spectrum-13.2000.2714.mfa2
 File: mellanox/mlxsw_spectrum2-29.2000.2714.mfa2
+File: mellanox/mlxsw_spectrum-13.2007.1168.mfa2
+File: mellanox/mlxsw_spectrum2-29.2007.1168.mfa2
+File: mellanox/mlxsw_spectrum3-30.2007.1168.mfa2
 
 Licence:
  Copyright (c) 2017-2020 Mellanox Technologies, Ltd. All rights reserved.