perf stat: Merge event counts from all hybrid PMUs

For hybrid events, by default stat aggregates and reports the event counts
per pmu.

  # ./perf stat -e cycles -a  sleep 1

   Performance counter stats for 'system wide':

      14,066,877,268      cpu_core/cycles/
       6,814,443,147      cpu_atom/cycles/

         1.002760625 seconds time elapsed

Sometimes, it's also useful to aggregate event counts from all PMUs.
Create a new option '--hybrid-merge' to enable that behavior and report
the counts without PMUs.

  # ./perf stat -e cycles -a --hybrid-merge  sleep 1

   Performance counter stats for 'system wide':

      20,732,982,512      cycles

         1.002776793 seconds time elapsed

Reviewed-by: Kan Liang <[email protected]>
Signed-off-by: Xing Zhengjun <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Ian Rogers <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jiri Olsa <[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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