MAINTAINERS: alsa-devel@alsa-project.org is moderated for non-subscribers

Fix a few inconsistent annotations to show that the alsa-devel mailing
list is moderated for non-subscribers.

Signed-off-by: Jim Davis <jim.epost@gmail.com>
Cc: Joe Perches <joe@perches.com>
Cc: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>