mm/huge_memory: remove pXd_devmap usage from insert_pXd_pfn()

Nothing uses PFN_DEV anymore so no need to create devmap pXd's when
mapping a PFN.  Instead special mappings will be created which ensures
vm_normal_page_pXd() will not return pages which don't have an associated
page.  This could change behaviour slightly on architectures where
pXd_devmap() does not imply pXd_special() as the normal page checks would
have fallen through to checking VM_PFNMAP/MIXEDMAP instead, which in
theory at least could have returned a page.

However vm_normal_page_pXd() should never have been returning pages for
pXd_devmap() entries anyway, so anything relying on that would have been a
bug.

Link: https://lkml.kernel.org/r/cd8658f9ff10afcfffd8b145a39d98bf1c595ffa.1750323463.git-series.apopple@nvidia.com
Signed-off-by: Alistair Popple <[email protected]>
Cc: Balbir Singh <[email protected]>
Cc: Björn Töpel <[email protected]>
Cc: Björn Töpel <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Chunyan Zhang <[email protected]>
Cc: Dan Williams <[email protected]>
Cc: David Hildenbrand <[email protected]>
Cc: Deepak Gupta <[email protected]>
Cc: Gerald Schaefer <[email protected]>
Cc: Inki Dae <[email protected]>
Cc: Jason Gunthorpe <[email protected]>
Cc: John Groves <[email protected]>
Cc: John Hubbard <[email protected]>
Cc: Lorenzo Stoakes <[email protected]>
Cc: Matthew Wilcox (Oracle) <[email protected]>
Cc: Will Deacon <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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