mctp: Reorder fields in 'struct mctp_route'

Group some variables based on their sizes to reduce hole and avoid padding.
On x86_64, this shrinks the size of 'struct mctp_route'
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>
Acked-by: Jeremy Kerr <jk@codeconstruct.com.au>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Link: https://lore.kernel.org/r/393ad1a5aef0aa28d839eeb3d7477da0e0eeb0b0.1687080803.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

include/net/mctp.h

@@ -234,9 +234,9 @@ struct mctp_flow {
 struct mctp_route {
 	mctp_eid_t		min, max;
 
-	struct mctp_dev		*dev;
-	unsigned int		mtu;
 	unsigned char		type;
+	unsigned int		mtu;
+	struct mctp_dev		*dev;
 	int			(*output)(struct mctp_route *route,
 					  struct sk_buff *skb);