tracing: Move the perf code out of trace_event.h

The trace_event.h file is for the generic trace event code. Move
the perf related code into its own trace header file perf.h

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
diff --git a/include/trace/define_trace.h b/include/trace/define_trace.h
index b13ba2f..09b3880 100644
--- a/include/trace/define_trace.h
+++ b/include/trace/define_trace.h
@@ -88,6 +88,7 @@
 
 #ifdef CONFIG_EVENT_TRACING
 #include <trace/trace_events.h>
+#include <trace/perf.h>
 #endif
 
 #undef TRACE_EVENT