mlx4_core: Disable P_Key Violation Traps

mlx4_core: Disable P_Key Violation Traps

Exadata virt edition, actively using IB partitions, is exposed to
excessive P_Key Violation Traps being sent to the SM. This is close to
a DoS attack. In addition, the OpenSM logs are flooded with these
messages, hiding potential other log messages deemed important to
investigate customer issues.

In fw version 2.35.6312, the traps are disabled, still counting the
P-Key Violations.

This commit will conditionally disable the P_Key Violation Traps
subject to fw version.

Orabug: 27693633

Signed-off-by: Håkon Bugge <haakon.bugge@oracle.com>
Reviewed-by: Shamir Rabinovitch <shamir.rabinovitch@oracle.com>
---

v1 -> v2:
   * Incorporated review comments form jch
   * Made the disabling dependent on fw version

Signed-off-by: Brian Maly <brian.maly@oracle.com>