mm: remove PFN_DEV, PFN_MAP, PFN_SPECIAL, PFN_SG_CHAIN and PFN_SG_LAST

The PFN_MAP flag is no longer used for anything, so remove it.  The
PFN_SG_CHAIN and PFN_SG_LAST flags never appear to have been used so also
remove them.  The last user of PFN_SPECIAL was removed by 653d7825c149
("dcssblk: mark DAX broken, remove FS_DAX_LIMITED support").

Users of PFN_DEV were removed earlier in this series by "mm: Remove
remaining uses of PFN_DEV".

Link: https://lkml.kernel.org/r/670b3950d70b4d97b905bb597dadfd3633de4314.1750323463.git-series.apopple@nvidia.com
Signed-off-by: Alistair Popple <[email protected]>
Acked-by: David Hildenbrand <[email protected]>
Reviewed-by: Christoph Hellwig <[email protected]>
Reviewed-by: Jason Gunthorpe <[email protected]>
Reviewed-by: Dan Williams <[email protected]>
Cc: Balbir Singh <[email protected]>
Cc: Björn Töpel <[email protected]>
Cc: Björn Töpel <[email protected]>
Cc: Chunyan Zhang <[email protected]>
Cc: Deepak Gupta <[email protected]>
Cc: Gerald Schaefer <[email protected]>
Cc: Inki Dae <[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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