locking: rename trace_softirq_[enter|exit] => lockdep_softirq_[enter|exit]

Impact: cleanup

The naming clashes with upcoming softirq tracepoints, so rename the
APIs to lockdep_*().

Requested-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/lib/locking-selftest.c b/lib/locking-selftest.c
index 280332c..619313e 100644
--- a/lib/locking-selftest.c
+++ b/lib/locking-selftest.c
@@ -157,11 +157,11 @@
 #define SOFTIRQ_ENTER()				\
 		local_bh_disable();		\
 		local_irq_disable();		\
-		trace_softirq_enter();		\
+		lockdep_softirq_enter();	\
 		WARN_ON(!in_softirq());
 
 #define SOFTIRQ_EXIT()				\
-		trace_softirq_exit();		\
+		lockdep_softirq_exit();		\
 		local_irq_enable();		\
 		local_bh_enable();