mm/khugepaged: clean up refcount check using folio_expected_ref_count()

Use folio_expected_ref_count() instead of open-coded logic in
is_refcount_suitable().  This avoids code duplication and improves
clarity.

Drop is_refcount_suitable() as it is no longer needed.

Link: https://lkml.kernel.org/r/20250526182818.37978-2-shivankg@amd.com


Signed-off-by: Shivank Garg <shivankg@amd.com>
Suggested-by: David Hildenbrand <david@redhat.com>
Acked-by: David Hildenbrand <david@redhat.com>
Acked-by: Dev Jain <dev.jain@arm.com>
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Bharata B Rao <bharata@amd.com>
Cc: Fengwei Yin <fengwei.yin@intel.com>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Mariano Pache <npache@redhat.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>