perf jevents: Support FCMask and PortMask

Skylake server uncore IIO events need new FCMask/PortMask fields. Support
those in the json parser and pass it through as a filter.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Link: http://lkml.kernel.org/r/20170816220201.19182-2-andi@firstfloor.org


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