ipv6: reorder struct inet6_ifaddr to remove padding on 64 bit builds

reorder struct inet6_ifaddr to remove padding on 64 bit builds
    
remove 8 bytes of padding so inet6_ifaddr becomes 192 bytes & fits into
a smaller slab.
    
Signed-off-by: Richard Kennedy <richard@rsk.demon.co.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/if_inet6.h

@@ -39,8 +39,6 @@ struct inet6_ifaddr
 
 	__u32			valid_lft;
 	__u32			prefered_lft;
-	unsigned long		cstamp;	/* created timestamp */
-	unsigned long		tstamp; /* updated timestamp */
 	atomic_t		refcnt;
 	spinlock_t		lock;
 
@@ -49,6 +47,9 @@ struct inet6_ifaddr
 
 	__u16			scope;
 
+	unsigned long		cstamp;	/* created timestamp */
+	unsigned long		tstamp; /* updated timestamp */
+
 	struct timer_list	timer;
 
 	struct inet6_dev	*idev;