libperf: Adopt perf_counts_values__scale() from tools/perf/util

Move perf_counts_values__scale() from tools/perf/util to tools/lib/perf
so that it can be used with libperf.

Committer notes:

As noted by Jiri, use __s8 instead of s8 on the exported function.

Signed-off-by: Shunsuke Nakamura <[email protected]>
Acked-by: Jiri Olsa <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Rob Herring <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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