btrfs: remove unused unlock_extent_atomic

As of "btrfs: do not use GFP_ATOMIC in the read endio" we no longer have
any users of unlock_extent_atomic, remove it.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>