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/kernel/softirq.c b/kernel/softirq.c
index 9041ea7..08a030f 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -180,7 +180,7 @@
 	account_system_vtime(current);
 
 	__local_bh_disable((unsigned long)__builtin_return_address(0));
-	trace_softirq_enter();
+	lockdep_softirq_enter();
 
 	cpu = smp_processor_id();
 restart:
@@ -220,7 +220,7 @@
 	if (pending)
 		wakeup_softirqd();
 
-	trace_softirq_exit();
+	lockdep_softirq_exit();
 
 	account_system_vtime(current);
 	_local_bh_enable();