kernel-interface: Pass full list of traffic selectors to add_sa()

While we can handle the first selector only in BEET mode in kernel-netlink,
passing the full list gives the backend more flexibility how to handle this
information.

src/libcharon/plugins/kernel_wfp/kernel_wfp_ipsec.c

@@ -2107,7 +2107,7 @@ METHOD(kernel_ipsec_t, add_sa, status_t,
 	u_int16_t int_alg, chunk_t int_key, ipsec_mode_t mode,
 	u_int16_t ipcomp, u_int16_t cpi, u_int32_t replay_window,
 	bool initiator, bool encap, bool esn, bool inbound,
-	traffic_selector_t *src_ts, traffic_selector_t *dst_ts)
+	linked_list_t *src_ts, linked_list_t *dst_ts)
 {
 	host_t *local, *remote;
 	entry_t *entry;