btrfs: also use kthread_associate_blkcg for uncompressible ranges

submit_one_async_extent needs to use submit_one_async_extent no matter
if the range it handles ends up beeing compressed or not as the deadlock
risk due to cgroup thottling is the same.  Call kthread_associate_blkcg
earlier to cover submit_uncompressed_range case as well.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>