mm,memory-tiers: use node-notifier instead of memory-notifier

mm,memory-tiers: use node-notifier instead of memory-notifier

memory-tier is only concerned when a numa node changes its memory state,
because it then needs to re-create the demotion list.  So stop using the
memory notifier and use the new numa node notifer instead.

Link: https://lkml.kernel.org/r/20250616135158.450136-6-osalvador@suse.de
Signed-off-by: Oscar Salvador <osalvador@suse.de>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Harry Yoo <harry.yoo@oracle.com>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Cc: Rakie Kim <rakie.kim@sk.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>