perf record: Set PERF_RECORD_PERIOD if attr->freq is set.

evsel__config() would only set PERF_RECORD_PERIOD if it set attr->freq
from perf record options. When it is set by libpfm events, it would not
get set. This changes evsel__config to see if attr->freq is set outside
of whether or not it changes attr->freq itself.

Signed-off-by: David Sharp <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Alexei Starovoitov <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Andrii Nakryiko <[email protected]>
Cc: Athira Jajeev <[email protected]>
Cc: Daniel Borkmann <[email protected]>
Cc: Ian Rogers <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: John Fastabend <[email protected]>
Cc: KP Singh <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Martin KaFai Lau <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Song Liu <[email protected]>
Cc: Stephane Eranian <[email protected]>
Cc: Yonghong Song <[email protected]>
Cc: david sharp <[email protected]>
Link: http://lore.kernel.org/lkml/[email protected]
Signed-off-by: Ian Rogers <[email protected]>
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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