IB/ipath: Set LID filtering for HCAs that support it.

Whenever the LID is set, notify the HCA specific code so that the
appropriate HW registers can be updated. Also log the info on the
console at low priority.

Signed-off-by: Dave Olson <dave.olson@qlogic.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>