perf test parse-events: Test complex name has required event format

test__checkevent_complex_name will use an "event" format which if not
present, such as with a placeholder PMU, will cause test failures. Skip
the test in this case to avoid failures in restricted environments.

Add perf_pmu__has_format utility as a general PMU utility.

Fixes: 628eaa4e877af823 ("perf pmus: Add placeholder core PMU")
Signed-off-by: Ian Rogers <[email protected]>
Tested-by: Thomas Richter <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Ian Rogers <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: James Clark <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Kan Liang <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Ravi Bangoria <[email protected]>
Cc: Rob Herring <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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