Add latest verified version of Mellanox Spectrum-family switch firmware,
for Spectrum (13.2008.2438), Spectrum-2 (29.2008.2438) and Spectrum-3
(30.2008.2438).

This update fixes the following issues:

- An issue where strictly-prioritized traffic gets a 9usec latency penalty
  on a congested port.
- Attempts to configure DSCP prioritization (QPDM register) on CPU
  port (local port 0) would result in FW crash.
- An issue in sampling traffic to the CPU due to incorrect trap
  prioritization.
- An issue in bulk-reading flow counters.
- Several issues related to FW upgrade and in-service FW upgrade.
- Incomplete clearing of activity bits in ECMP containers with a very high
  number of individual ECMP entries (100K).
- A crash during router deinit.
Signed-off-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Josh Boyer <jwboyer@kernel.org>