bsg: Remove unused function bsg_goose_queue()

The function bsg_goose_queue() does not have any in-tree callers,
so let's remove it.

Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>