net: shell: events: IPv4 mcast addr add and del were missing

The event monitor did not handled IPv4 multicast address
addition or deletion information.

Signed-off-by: Jukka Rissanen <[email protected]>

Author: jukkar

subsys/net/lib/shell/events.c

@@ -292,6 +292,18 @@ static char *get_l3_desc(struct event_msg *msg,
 		info = net_addr_ntop(AF_INET, msg->data, extra_info,
 				     extra_info_len);
 		break;
+	case NET_EVENT_IPV4_MADDR_ADD:
+		*desc = "IPv4 mcast address";
+		*desc2 = "add";
+		info = net_addr_ntop(AF_INET, msg->data, extra_info,
+				     extra_info_len);
+		break;
+	case NET_EVENT_IPV4_MADDR_DEL:
+		*desc = "IPv4 mcast address";
+		*desc2 = "del";
+		info = net_addr_ntop(AF_INET, msg->data, extra_info,
+				     extra_info_len);
+		break;
 	case NET_EVENT_IPV4_ROUTER_ADD:
 		*desc = "IPv4 router";
 		*desc2 = "add";