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>