drivers,hmat: use node-notifier instead of memory-notifier

drivers,hmat: use node-notifier instead of memory-notifier

hmat driver is only concerned when a numa node changes its memory state,
specifically when a numa node with memory comes into play for the first
time, because it will register the memory_targets belonging to that numa
node.  So stop using the memory notifier and use the new numa node notifer
instead.

Link: https://lkml.kernel.org/r/20250616135158.450136-8-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>