IB/mad: Split IB SMI handling from MAD Recv handler

Make a helper function to process Directed Route SMPs to be called by the IB
MAD Recv Handler, ib_mad_recv_done_handler.

This cleans up the MAD receive handler code a bit and allows for us to better
share the SMP processing code between IB and OPA SMPs.

IB and OPA SMPs share the same processing algorithm but have different header
formats and permissive LID detection.  Therefore this and subsequent patches
split the common processing code from the IB specific code in anticipation of
sharing those algorithms with the OPA code.

Signed-off-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

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