perf_counter tools: move helper library to util/*

Clean up the top level directory a bit by moving all the helper libraries
to util/*.[ch].

Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/Documentation/perf_counter/builtin-help.c b/Documentation/perf_counter/builtin-help.c
index a136d61..6616de0 100644
--- a/Documentation/perf_counter/builtin-help.c
+++ b/Documentation/perf_counter/builtin-help.c
@@ -3,13 +3,13 @@
  *
  * Builtin help command
  */
-#include "cache.h"
+#include "util/cache.h"
 #include "builtin.h"
-#include "exec_cmd.h"
+#include "util/exec_cmd.h"
 #include "common-cmds.h"
-#include "parse-options.h"
-#include "run-command.h"
-#include "help.h"
+#include "util/parse-options.h"
+#include "util/run-command.h"
+#include "util/help.h"
 
 static struct man_viewer_list {
 	struct man_viewer_list *next;