btrfs: remove extra space info prototypes in ctree.h

These are defined already in space-info.h, remove them from ctree.h.

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