mm: add missing mmu_notifier_clear_young for !MMU_NOTIFIER

Remove the now unnecessary ifdef in mm/damon/vaddr.c as well.

Link: https://lkml.kernel.org/r/20241021160212.9935-1-jthoughton@google.com


Signed-off-by: James Houghton <jthoughton@google.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Acked-by: David Hildenbrand <david@redhat.com>
Reviewed-by: SeongJae Park <sj@kernel.org>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>