ALSA: seq: Drop snd_seq_autoload_lock() and _unlock()

The autoload lock became already superfluous due to the recent rework
of autoload code.  Let's drop them now.  This allows us to simplify a
few codes nicely.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/include/sound/seq_kernel.h b/include/sound/seq_kernel.h
index 18a2ac5..feb58d4 100644
--- a/include/sound/seq_kernel.h
+++ b/include/sound/seq_kernel.h
@@ -99,13 +99,9 @@
 int snd_seq_event_port_detach(int client, int port);
 
 #ifdef CONFIG_MODULES
-void snd_seq_autoload_lock(void);
-void snd_seq_autoload_unlock(void);
 void snd_seq_autoload_init(void);
-#define snd_seq_autoload_exit()	snd_seq_autoload_lock()
+void snd_seq_autoload_exit(void);
 #else
-#define snd_seq_autoload_lock()
-#define snd_seq_autoload_unlock()
 #define snd_seq_autoload_init()
 #define snd_seq_autoload_exit()
 #endif