perf tools: Factorize the event structure definitions in a single file

Factorize the multiple definition of the events structures into a
single util/event.h file.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Brice Goglin <Brice.Goglin@inria.fr>

tools/perf/util/util.h

@@ -83,6 +83,8 @@
 #include <inttypes.h>
 #include "../../../include/linux/magic.h"
 
+#include "event.h"
+
 #ifndef NO_ICONV
 #include <iconv.h>
 #endif