perf jevents: Allow multiple metricgroups.json files
Allow multiple metricgroups.json files by handling any file ending
with metricgroups.json as a metricgroups file.
Signed-off-by: Ian Rogers <irogers@google.com>
Tested-by: Thomas Falcon <thomas.falcon@intel.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
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