mm: unexport vmf_insert_mixed_mkwrite

vmf_insert_mixed_mkwrite is only used by the built-in DAX code.

Link: https://lkml.kernel.org/r/20240702072327.1640911-1-hch@lst.de


Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Alistair Popple <apopple@nvidia.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>