Fix duplication of KW41Z Nanostack driver

features/nanostack/targets/TARGET_Freescale/TARGET_KW41Z/NanostackRfPhyKw41z.h

@@ -1,36 +0,0 @@
-/*
- * Copyright (c) 2018 ARM Limited. All rights reserved.
- * 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.
- */
-
-#ifndef NANOSTACK_PHY_KW41Z_H_
-#define NANOSTACK_PHY_KW41Z_H_
-
-#if MBED_CONF_RTOS_PRESENT
-#include "rtos/rtos.h"
-#endif
-#include "NanostackRfPhy.h"
-#include "fsl_common.h"
-
-class NanostackRfPhyKw41z : public NanostackRfPhy {
-public:
-    NanostackRfPhyKw41z();
-    ~NanostackRfPhyKw41z();
-    int8_t rf_register();
-    void rf_unregister();
-    void get_mac_address(uint8_t *mac);
-    void set_mac_address(uint8_t *mac);
-};
-
-#endif /* NANOSTACK_PHY_KW41Z_H_ */