perf vendor events: Update JSON metrics for Broadwell Server

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Link: http://lkml.kernel.org/r/20170914200748.GA13837@tassilo.jf.intel.com


Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>