WiFiInterface::get_target_default_instance() added to TARGET_WICED.

targets/TARGET_WICED/README.md

@@ -1 +1 @@
-This directory tree contains binaries build from Cypress WICED SDK modified for Mbed OS and released under Permissive Binary License.
+This directory tree contains binaries build from Cypress WICED SDK modified for Mbed OS and released under Permissive Binary License.

targets/TARGET_WICED/wiced_interface/default_wifi_interface.cpp

@@ -0,0 +1,24 @@
+/*
+ * Copyright (c) 2018, Arm Limited and affiliates.
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "WicedInterface.h"
+
+WiFiInterface *WiFiInterface::get_target_default_instance()
+{
+    static WicedInterface wifi;
+    return &wifi;
+}