perf hists: Factor out hists__reset_column_width()

The stdio and tui has same code to reset hpp format column width.
Factor it out as a new function.

Suggested-and-Acked-by: Jiri Olsa <[email protected]>
Signed-off-by: Namhyung Kim <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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