irda: Convert IRDA_DEBUG to pr_debug

Use the normal kernel debugging mechanism which also
enables dynamic_debug at the same time.

Other miscellanea:

o Remove sysctl for irda_debug
o Remove function tracing like uses (use ftrace instead)
o Coalesce formats
o Realign arguments
o Remove unnecessary OOM messages

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/irda/irlap.h b/include/net/irda/irlap.h
index fb4b76d..6f23e82 100644
--- a/include/net/irda/irlap.h
+++ b/include/net/irda/irlap.h
@@ -303,7 +303,7 @@
 	if (!self || self->magic != LAP_MAGIC)
 		return;
 
-	IRDA_DEBUG(4, "next LAP state = %s\n", irlap_state[state]);
+		pr_debug("next LAP state = %s\n", irlap_state[state]);
 	*/
 	self->state = state;
 }