block, bfq: give a better name to bfq_bfqq_may_idle

The actual goal of the function bfq_bfqq_may_idle is to tell whether
it is better to perform device idling (more precisely: I/O-dispatch
plugging) for the input bfq_queue, either to boost throughput or to
preserve service guarantees. This commit improves the name of the
function accordingly.

Tested-by: Holger Hoffstätte <[email protected]>
Tested-by: Oleksandr Natalenko <[email protected]>
Signed-off-by: Paolo Valente <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>

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