IB/hfi1: Immediately apply congestion setting MAD

The handling of the congestion setting MAD packet only
saved off the values, waiting for a congestion control
table packet before going active.  Instead, immediately
apply the values.

Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Dean Luick <dean.luick@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>