libperf: Add PERF_RECORD_SWITCH 'struct context_switch_event' to perf/event.h

Move the PERF_RECORD_SWITCH event definition to libperf's event.h.

In order to keep libperf simple, we switch 'u64/u32/u16/u8' types used
events to their generic '__u*' versions.
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20190828135717.7245-14-jolsa@kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/lib/include/perf/event.h

@@ -110,6 +110,12 @@ struct perf_record_sample {
 	__u64			 array[];
 };
 
+struct context_switch_event {
+	struct perf_event_header header;
+	__u32			 next_prev_pid;
+	__u32			 next_prev_tid;
+};
+
 struct attr_event {
 	struct perf_event_header header;
 	struct perf_event_attr	 attr;

tools/perf/util/event.h

@@ -332,12 +332,6 @@ struct events_stats {
 	u32 nr_proc_map_timeout;
 };
 
-struct context_switch_event {
-	struct perf_event_header header;
-	u32 next_prev_pid;
-	u32 next_prev_tid;
-};
-
 struct thread_map_event_entry {
 	u64	pid;
 	char	comm[16];