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 <irogers@google.com>
Reviewed-by: Kan Liang <kan.liang@linux.intel.com>
Tested-by: Atish Patra <atishp@rivosinc.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Beeman Strong <beeman@rivosinc.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@arm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20240416061533.921723-7-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

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