net: Fix alignment error with net_ipaddr_copy()

As struct sockaddr have now alignment of 4 bytes, net_ipaddr_copy()
gives the following error if used for sockaddr:

  error: alignment 1 of ‘struct <anonymous>’ is less than 4
  [-Werror=packed-not-aligned]

Just use memcpy() instead, net_ipaddr_copy() was intended to use with IP
addresses, not socket related structs.

Signed-off-by: Robert Lubos <robert.lubos@nordicsemi.no>

subsys/mgmt/mcumgr/transport/src/smp_udp.c

@@ -154,7 +154,7 @@ static int smp_udp_ud_copy(struct net_buf *dst, const struct net_buf *src)
 	struct sockaddr *src_ud = net_buf_user_data(src);
 	struct sockaddr *dst_ud = net_buf_user_data(dst);
 
-	net_ipaddr_copy(dst_ud, src_ud);
+	memcpy(dst_ud, src_ud, sizeof(struct sockaddr));
 
 	return MGMT_ERR_EOK;
 }
@@ -249,7 +249,7 @@ static void smp_udp_receive_thread(void *p1, void *p2, void *p3)
 			}
 			net_buf_add_mem(nb, conf->recv_buffer, len);
 			ud = net_buf_user_data(nb);
-			net_ipaddr_copy(ud, &addr);
+			memcpy(ud, &addr, sizeof(addr));
 
 			smp_rx_req(&conf->smp_transport, nb);
 		} else if (len < 0) {

subsys/net/lib/coap/coap.c

@@ -1962,7 +1962,7 @@ void coap_observer_init(struct coap_observer *observer,
 {
 	observer->tkl = coap_header_get_token(request, observer->token);
 
-	net_ipaddr_copy(&observer->addr, addr);
+	memcpy(&observer->addr, addr, sizeof(*addr));
 }
 
 static inline void coap_observer_raise_event(struct coap_resource *resource,