perf parse-events: Pass cpu_list as a perf_cpu_map in __add_event()

Previously the cpu_list is a string and typically no cpu_list is
passed to __add_event().

Wanting to make events have their cpus distinct from the PMU means that
in more occassions we want to pass a cpu_list.

If we're reading this from sysfs it is easier to read a perf_cpu_map
than allocate and pass around strings that will later be parsed.

Signed-off-by: Ian Rogers <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Ananth Narayan <[email protected]>
Cc: Bjorn Helgaas <[email protected]>
Cc: Dhananjay Ugwekar <[email protected]>
Cc: Dominique Martinet <[email protected]>
Cc: Gautham Shenoy <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: James Clark <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Cc: K Prateek Nayak <[email protected]>
Cc: Kan Liang <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Ravi Bangoria <[email protected]>
Cc: Sandipan Das <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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