perf namespaces: Add more appropriate set of headers

We don't need perf.h, that is a kitchen sink, all we need is
perf_events.h for perf_ns_link_info, sys/types.h for pid_t and
linux/types.h for u64, list_head.

Cc: Adrian Hunter <[email protected]>
Cc: David Ahern <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Li Zhijian <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Wang Nan <[email protected]>
Link: http://lkml.kernel.org/n/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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