perf kvm: Refactor overall statistics

Currently the tool computes overall statistics when sort the results.
This patch refactors overall statistics during events processing,
therefore, the function update_total_coun() is not needed anymore, an
extra benefit is we can de-couple code between the statistics and the
sorting.

This patch is not expected any functionality changes.

Reviewed-by: James Clark <[email protected]>
Signed-off-by: Leo Yan <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Ian Rogers <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: John Garry <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[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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