mm: merge folio_is_secretmem() and folio_fast_pin_allowed() into gup_fast_folio_allowed()

folio_is_secretmem() is currently only used during GUP-fast.  Nowadays,
folio_fast_pin_allowed() performs similar checks during GUP-fast and
contains a lot of careful handling -- READ_ONCE() -- , sanity checks --
lockdep_assert_irqs_disabled() -- and helpful comments on how this
handling is safe and correct.

So let's merge folio_is_secretmem() into folio_fast_pin_allowed().  Rename
folio_fast_pin_allowed() to gup_fast_folio_allowed(), to better match the
new semantics.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: David Hildenbrand <[email protected]>
Reviewed-by: Mike Rapoport (IBM) <[email protected]>
Cc: David Hildenbrand <[email protected]>
Cc: Lorenzo Stoakes <[email protected]>
Cc: Miklos Szeredi <[email protected]>
Cc: xingwei lee <[email protected]>
Cc: yue sun <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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