ipsec-types: Add a proper hash function for ipsec_sa_cfg_t

While 3c12905103 ("ipsec: Add function to compare two ipsec_sa_cfg_t
instances") added a comparison function to avoid issues with non-zeroed
padding, hashes were still calculated using chunk_hash().

src/libcharon/plugins/kernel_netlink/kernel_netlink_ipsec.c

@@ -470,7 +470,7 @@ static u_int ipsec_sa_hash(ipsec_sa_t *sa)
 						  chunk_hash_inc(chunk_from_thing(sa->mark),
 						  chunk_hash_inc(chunk_from_thing(sa->if_id),
 						  chunk_hash_inc(chunk_from_thing(sa->hw_offload),
-						  chunk_hash(chunk_from_thing(sa->cfg)))))));
+						  ipsec_sa_cfg_hash(&sa->cfg))))));
 }
 
 /**

src/libcharon/plugins/kernel_pfkey/kernel_pfkey_ipsec.c

@@ -348,7 +348,7 @@ static u_int ipsec_sa_hash(ipsec_sa_t *sa)
 {
 	return chunk_hash_inc(sa->src->get_address(sa->src),
 						  chunk_hash_inc(sa->dst->get_address(sa->dst),
-						  chunk_hash(chunk_from_thing(sa->cfg))));
+						  ipsec_sa_cfg_hash(&sa->cfg)));
 }
 
 /**