Mellanox: Add new mlxsw_spectrum firmware xx.2016.3900

Add latest verified version of Nvidia Spectrum-family switch firmware,
for Spectrum (13.2016.3900), Spectrum-2 (29.2016.3900), Spectrum-3
(30.2016.3900) and Spectrum-4 (34.2016.3900).

Besides many other changes and fixes, this version includes a fix for an
issue with reading QSFP module EEPROM reported at the link below, which was
present with the previously issued XX.2014.4012.

Link: https://forums.developer.nvidia.com/t/unable-to-access-qsfp-module-eeprom-after-latest-linux-firmware-upgrade/351299
Signed-off-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Josh Boyer <jwboyer@kernel.org>

WHENCE

@@ -7031,6 +7031,10 @@ File: mellanox/mlxsw_spectrum-13.2014.4012.mfa2
 File: mellanox/mlxsw_spectrum2-29.2014.4012.mfa2
 File: mellanox/mlxsw_spectrum3-30.2014.4012.mfa2
 File: mellanox/mlxsw_spectrum4-34.2014.4012.mfa2
+File: mellanox/mlxsw_spectrum-13.2016.3900.mfa2
+File: mellanox/mlxsw_spectrum2-29.2016.3900.mfa2
+File: mellanox/mlxsw_spectrum3-30.2016.3900.mfa2
+File: mellanox/mlxsw_spectrum4-34.2016.3900.mfa2
 
 Licence: Redistributable. See LICENSE.mellanox for details.