perf list: Check if libpfm4 event is supported

Some of its event info cannot be used directly due to missing default
attributes.  Let's check if the event is supported before printing like
we do for hw and cache events.

Signed-off-by: Namhyung Kim <[email protected]>
Acked-by: Ian Rogers <irogers>@google.com>
Cc: Adrian Hunter <[email protected]>
Cc: Ian Rogers <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Stephane Eranian <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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