perf parse-events: Legacy cache names on all PMUs and lower priority

Prior behavior is to not look for legacy cache names in sysfs/JSON and
to create events on all core PMUs. New behavior is to look for
sysfs/JSON events first on all PMUs, for core PMUs add a legacy event
if the sysfs/JSON event isn't present.

This is done so that there is consistency with how event names in
terms are handled and their prioritization of sysfs/JSON over
legacy. It may make sense to use a legacy cache event name as an event
name on a non-core PMU so we should allow it.

Signed-off-by: Ian Rogers <[email protected]>
Reviewed-by: Kan Liang <[email protected]>
Tested-by: Atish Patra <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Beeman Strong <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: James Clark <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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