cifs: Don't support ITER_XARRAY

There's now no need to support ITER_XARRAY in cifs as netfslib hands down
ITER_FOLIOQ instead - and that's simpler to use with iterate_and_advance()
as it doesn't hold the RCU read lock over the step function.

This is part of the process of phasing out ITER_XARRAY.

Signed-off-by: David Howells <[email protected]>
cc: Steve French <[email protected]>
cc: Paulo Alcantara <[email protected]>
cc: Tom Talpey <[email protected]>
cc: Enzo Matsumiya <[email protected]>
cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]/ # v2
Signed-off-by: Christian Brauner <[email protected]>

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