block, bfq: move io_cq-persistent bfqq data into a dedicated struct

With a multi-actuator drive, a process may get associated with multiple
bfq_queues: one queue for each of the N actuators. So, the bfq_io_cq
data structure must be able to accommodate its per-queue persistent
information for N queues. Currently it stores this information for
just one queue, in several scalar fields.

This is a preparatory commit for moving to accommodating persistent
information for N queues. In particular, this commit packs all the
above scalar fields into a single data structure. Then there is now
only one field, in bfq_io_cq, that stores all the above information. This
scalar field will then be turned into an array by a following commit.

Suggested-by: Damien Le Moal <[email protected]>
Reviewed-by: Damien Le Moal <[email protected]>
Signed-off-by: Gianmarco Lusvardi <[email protected]>
Signed-off-by: Giulio Barabino <[email protected]>
Signed-off-by: Emiliano Maccaferri <[email protected]>
Signed-off-by: Paolo Valente <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jens Axboe <[email protected]>

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