netlabel: Reorder fields in 'struct netlbl_domaddr6_map'

Group some variables based on their sizes to reduce hole and avoid padding.
On x86_64, this shrinks the size of 'struct netlbl_domaddr6_map'
from 72 to 64 bytes.

It saves a few bytes of memory and is more cache-line friendly.
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Acked-by: Paul Moore <paul@paul-moore.com>
Link: https://lore.kernel.org/r/aa109847260e51e174c823b6d1441f75be370f01.1687083361.git.christophe.jaillet@wanadoo.frSigned-off-by: Jakub Kicinski <kuba@kernel.org>

net/netlabel/netlabel_domainhash.h

@@ -57,8 +57,8 @@ struct netlbl_domaddr6_map {
 
 struct netlbl_dom_map {
 	char *domain;
-	u16 family;
 	struct netlbl_dommap_def def;
+	u16 family;
 
 	u32 valid;
 	struct list_head list;