perf pmu: Save pmu name

On hybrid platform, one event is available on one pmu
(such as, available on cpu_core or on cpu_atom).

This patch saves the pmu name to the pmu field of struct perf_pmu_alias.
Then next we can know the pmu which the event can be enabled on.

Signed-off-by: Jin Yao <[email protected]>
Reviewed-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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