tracing/fastboot: change the printing of boot tracer according to bootgraph.pl

Change the boot tracer printing to make it parsable for
the scripts/bootgraph.pl script.

We have now to output two lines for each initcall, according to the
printk in do_one_initcall() in init/main.c
We need now the call's time and the return's time.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index 91954eb..4455490 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -216,6 +216,8 @@
 	initcall_t		func;
 	int			result;
 	unsigned long long	duration;
+	ktime_t			calltime;
+	ktime_t			rettime;
 };
 
 #ifdef CONFIG_BOOT_TRACER