mm/page_idle.c: remove redundant mmu notifier in aging code

mm/page_idle.c: remove redundant mmu notifier in aging code

Now we have mmu_notifier_clear_young immediately follows
pmdp_clear_young_notify which internally calls mmu_notifier_clear_young,
this is redundant.  change it with non-notify variant and keep consistent
with ptep aging code.

Link: https://lkml.kernel.org/r/20260203102649.2486836-1-qin.yuA@h3c.com
Signed-off-by: qinyu <qin.yuA@h3c.com>
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Reviewed-by: SeongJae Park <sj@kernel.org>
Acked-by: David Hildenbrand (arm) <david@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>