netfs, mm: Add set/end/wait_on_page_fscache() aliases

Add set/end/wait_on_page_fscache() as aliases of
set/end/wait_page_private_2().  These allow a page to marked with
PG_fscache, the flag to be removed and waiters woken and waiting for the
flag to be cleared.  A ref on the page is also taken and dropped.

[Linus suggested putting the fscache-themed functions into the
 caching-specific headers rather than pagemap.h[1]]

Changes:
v5:
- Mirror the changes to the core routines[2].

Signed-off-by: David Howells <[email protected]>
Tested-by: Jeff Layton <[email protected]>
Tested-by: Dave Wysochanski <[email protected]>
Tested-By: Marc Dionne <[email protected]>
cc: Linus Torvalds <[email protected]>
cc: Matthew Wilcox <[email protected]>
cc: [email protected]
cc: [email protected]
cc: [email protected]
cc: [email protected]
cc: [email protected]
cc: [email protected]
cc: [email protected]
cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]/
Link: https://lore.kernel.org/r/CAHk-=wjgA-74ddehziVk=XAEMTKswPu1Yw4uaro1R3ibs27ztw@mail.gmail.com/ [1]
Link: https://lore.kernel.org/r/161340393568.1303470.4997526899111310530.stgit@warthog.procyon.org.uk/ # v3
Link: https://lore.kernel.org/r/161539536093.286939.5076448803512118764.stgit@warthog.procyon.org.uk/ # v4
Link: https://lore.kernel.org/r/[email protected]/ [2]
Link: https://lore.kernel.org/r/161653793873.2770958.12157243390965814502.stgit@warthog.procyon.org.uk/ # v5
Link: https://lore.kernel.org/r/161789075327.6155.7432127924219092385.stgit@warthog.procyon.org.uk/ # v6

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