tracing: add schedule events to event trace

This patch changes the trace/sched.h to use the DECLARE_TRACE_FMT
such that they are automatically registered with the event tracer.

And it also adds the tracing sched headers to kernel/trace/events.c

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
diff --git a/kernel/trace/Makefile b/kernel/trace/Makefile
index c736356..664b6c0 100644
--- a/kernel/trace/Makefile
+++ b/kernel/trace/Makefile
@@ -39,5 +39,6 @@
 obj-$(CONFIG_WORKQUEUE_TRACER) += trace_workqueue.o
 obj-$(CONFIG_BLK_DEV_IO_TRACE)	+= blktrace.o
 obj-$(CONFIG_EVENT_TRACER) += trace_events.o
+obj-$(CONFIG_EVENT_TRACER) += events.o
 
 libftrace-y := ftrace.o