elevator: Remove argument from elevator_find_get

elevator: Remove argument from elevator_find_get

Commit e4eb37cc0f3ed ("block: Remove elevator required features")
removed the usage of `struct request_queue` from elevator_find_get(),
but didn't removed the argument.

Remove the "struct request_queue *q" argument from elevator_find_get()
given it is useless.

Fixes: e4eb37cc0f3e ("block: Remove elevator required features")
Signed-off-by: Breno Leitao <leitao@debian.org>
Link: https://lore.kernel.org/r/20241011155615.3361143-1-leitao@debian.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>