shmem: add shmem_read_folio() and shmem_read_folio_gfp()

These are the folio replacements for shmem_read_mapping_page() and
shmem_read_mapping_page_gfp().

[[email protected]: fix shmem_read_mapping_page_gfp(), per Matthew]
  Link: https://lkml.kernel.org/r/[email protected]
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Matthew Wilcox (Oracle) <[email protected]>
Cc: Mark Hemment <[email protected]>
Cc: Charan Teja Kalla <[email protected]>
Cc: David Rientjes <[email protected]>
Cc: Hugh Dickins <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Pavankumar Kondeti <[email protected]>
Cc: Shakeel Butt <[email protected]>
Cc: Suren Baghdasaryan <[email protected]>
Cc: Vlastimil Babka <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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