tracing/events: add trace-events-sample

This patch adds a sample to the samples directory on how to create
and use TRACE_EVENT trace points.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
diff --git a/samples/Kconfig b/samples/Kconfig
index 4b02f5a..93f41c0 100644
--- a/samples/Kconfig
+++ b/samples/Kconfig
@@ -19,6 +19,13 @@
 	help
 	  This build tracepoints example modules.
 
+config SAMPLE_TRACE_EVENTS
+	tristate "Build trace_events examples"
+	depends on EVENT_TRACING
+	default m
+	help
+	  This build trace event example modules.
+
 config SAMPLE_KOBJECT
 	tristate "Build kobject examples"
 	help