mm/hugetlb: set PTE as huge in hugetlb_change_protection and remove_migration_pte

mm/hugetlb: set PTE as huge in hugetlb_change_protection and remove_migration_pte

When setting a huge PTE, besides calling pte_mkhuge(), we also need to
call arch_make_huge_pte(), which we indeed do in make_huge_pte(), but we
forget to do in hugetlb_change_protection() and remove_migration_pte().

Signed-off-by: Zhigang Lu <[email protected]>
Signed-off-by: Chris Metcalf <[email protected]>
Reviewed-by: Michal Hocko <[email protected]>
Acked-by: Hillf Danton <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>