[IPSEC] flow: reorder "struct flow_cache_entry" and remove SLAB_HWCACHE_ALIGN

1) We can shrink sizeof(struct flow_cache_entry) by 8 bytes on 64bit arches.
2) No need to align these structures to hardware cache lines, this only waste 
   ram for very litle gain.
Signed-off-by: NEric Dumazet <dada1@cosmosbay.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/core/flow.c

@@ -30,8 +30,8 @@ struct flow_cache_entry {
 	struct flow_cache_entry	*next;
 	u16			family;
 	u8			dir;
-	struct flowi		key;
 	u32			genid;
+	struct flowi		key;
 	void			*object;
 	atomic_t		*object_ref;
 };
@@ -346,7 +346,7 @@ static int __init flow_cache_init(void)
 
 	flow_cachep = kmem_cache_create("flow_cache",
 					sizeof(struct flow_cache_entry),
-					0, SLAB_HWCACHE_ALIGN|SLAB_PANIC,
+					0, SLAB_PANIC,
 					NULL);
 	flow_hash_shift = 10;
 	flow_lwm = 2 * flow_hash_size;