perf timechart: Get number of CPUs from perf header

Print all CPUs, even if there were no events (use perf header to get
number of CPUs).

This is required to support topology in the next patch.

Signed-off-by: Stanislav Fomichev <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Ramkumar Ramachandra <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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