perf cpumap: No need to include perf.h, ditch it

From a quick look this was never needed and just polluted the build,
needlessly making things including cpumap.h to be rebuild if perf.h or
anything it includes gets changed.

Cc: Adrian Hunter <[e-mail]>
Cc: Jiri Olsa <[e-mail]>
Cc: Namhyung Kim <[e-mail]>
Link: https://lkml.kernel.org/n/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/util/cpumap.h

···
 #include <internal/cpumap.h>
 #include <perf/cpumap.h>
 
-#include "perf.h"
-
 struct cpu_map_data;
 
 struct perf_cpu_map *perf_cpu_map__empty_new(int nr);