perf tools: Check mem-loads auxiliary event

For some platforms, an auxiliary event has to be enabled
simultaneously with the load latency event.

For Alderlake, the auxiliary event is created in "cpu_core" pmu.

So first we need to check the existing of "cpu_core" pmu
and then check if this pmu has auxiliary event.

Signed-off-by: Jin Yao <[email protected]>
Acked-by: Jiri Olsa <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Kan Liang <[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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