[ALSA] unlocked/compat_ioctl rewrite for control API

Control Midlevel
ioctl handler for control API is rewritten using unlocked/compat_ioctl.
The 32bit wrapper is merged to the core module.

Added a new register/unregister function for compat control ioctls.
Signed-off-by: Takashi Iwai <tiwai@suse.de>

include/sound/control.h

@@ -119,6 +119,13 @@ int snd_ctl_create(snd_card_t *card);
 
 int snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn);
 int snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn);
+#ifdef CONFIG_COMPAT
+int snd_ctl_register_ioctl_compat(snd_kctl_ioctl_func_t fcn);
+int snd_ctl_unregister_ioctl_compat(snd_kctl_ioctl_func_t fcn);
+#else
+#define snd_ctl_register_ioctl_compat(fcn)
+#define snd_ctl_unregister_ioctl_compat(fcn)
+#endif
 
 int snd_ctl_elem_read(snd_card_t *card, snd_ctl_elem_value_t *control);
 int snd_ctl_elem_write(snd_card_t *card, snd_ctl_file_t *file, snd_ctl_elem_value_t *control);