IB/MAD: Add SMP details to MAD tracing

Decode more information from the packet and include it in the trace.

Reviewed-by: "Ruhl, Michael J" <michael.j.ruhl@intel.com>
Signed-off-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>