btrfs: move the btrfs_verity_descriptor_item defs up in ctree.h

These are wrapped in CONFIG_FS_VERITY, but we can have the definitions
without verity enabled.  Move these definitions up with the other
accessor helpers.

Reviewed-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>