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>