fscrypt: work on block_devices instead of request_queues

request_queues are a block layer implementation detail that should not
leak into file systems.  Change the fscrypt inline crypto code to
retrieve block devices instead of request_queues from the file system.
As part of that, clean up the interaction with multi-device file systems
by returning both the number of devices and the actual device array in a
single method call.

Signed-off-by: Christoph Hellwig <[email protected]>
[ebiggers: bug fixes and minor tweaks]
Signed-off-by: Eric Biggers <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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