perf header: Move is_cpu_online to numa bench

The helper function is only used in the NUMA benchmark as typically
online CPUs are determined through perf_cpu_map__new_online_cpus().

Reduce the scope of the function for now.

Reviewed-by: James Clark <[email protected]>
Signed-off-by: Ian Rogers <[email protected]>
Tested-by: Xu Yang <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Albert Ou <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Alexandre Ghiti <[email protected]>
Cc: Athira Rajeev <[email protected]>
Cc: Ben Zong-You Xie <[email protected]>
Cc: Benjamin Gray <[email protected]>
Cc: Bibo Mao <[email protected]>
Cc: Clément Le Goffic <[email protected]>
Cc: Dima Kogan <[email protected]>
Cc: Dr. David Alan Gilbert <[email protected]>
Cc: Huacai Chen <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: John Garry <[email protected]>
Cc: Kan Liang <[email protected]>
Cc: Leo Yan <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Masami Hiramatsu <[email protected]>
Cc: Mike Leach <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Palmer Dabbelt <[email protected]>
Cc: Paul Walmsley <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Ravi Bangoria <[email protected]>
Cc: Sandipan Das <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: Yicong Yang <[email protected]>
Cc: [email protected]
Cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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