perf/core: Introduce perf_prepare_header()

Factor out perf_prepare_header() so that it can call
perf_prepare_sample() without a header if not needed.

Also it checks the filtered_sample_type to avoid duplicate
work when perf_prepare_sample() is called twice (or more).

Suggested-by: Peter Zijlstr <[email protected]>
Signed-off-by: Namhyung Kim <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
Tested-by: Jiri Olsa <[email protected]>
Acked-by: Jiri Olsa <[email protected]>
Acked-by: Song Liu <[email protected]>
Acked-by: Peter Zijlstra <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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