perf pmu: Add function to check if a pmu file exists

Add a utility function perf_pmu__file_exists() to check if a given pmu
file exists in the sysfs filesystem.

Signed-off-by: German Gomez <[email protected]>
Acked-by: Suzuki Poulouse <[email protected]>
Tested-by: Tanmay Jagdale <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Bharat Bhushan <[email protected]>
Cc: George Cherian <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: John Garry <[email protected]>
Cc: Leo Yan <[email protected]>
Cc: Linu Cherian <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Mathieu Poirier <[email protected]>
Cc: Mike Leach <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Sunil Kovvuri Goutham <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: [email protected]
Cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: James Clark <[email protected]>
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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