perf callchain: No need to include perf.h

So ditch it.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lkml.kernel.org/n/tip-bodhwdvcds9ahk26dy4w8m71@git.kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/callchain.h

@@ -2,7 +2,6 @@
 #ifndef __PERF_CALLCHAIN_H
 #define __PERF_CALLCHAIN_H
 
-#include "../perf.h"
 #include <linux/list.h>
 #include <linux/rbtree.h>
 #include "event.h"