Fix lwm2m header inclusions

os/services/lwm2m/lwm2m-engine.c

@@ -53,12 +53,14 @@
 #include "lwm2m-tlv-writer.h"
 #include "lib/list.h"
 #include "sys/cc.h"
-#include "net/ipv6/uip-ds6.h"
-#include "net/routing/routing.h"
 #include <stdio.h>
 #include <string.h>
 #include <inttypes.h>
 
+#ifndef LWM2M_ENGINE_CLIENT_ENDPOINT_NAME
+#include "net/ipv6/uip-ds6.h"
+#endif /* LWM2M_ENGINE_CLIENT_ENDPOINT_NAME */
+
 /* Log configuration */
 #include "coap-log.h"
 #define LOG_MODULE "lwm2m-engine"