drivers: adc: fix license

/**

 * Synopsys DesignWare Sensor and Control IP Subsystem IO Software Driver and

 * documentation (hereinafter, "Software") is an Unsupported proprietary work

 * of Synopsys, Inc. unless otherwise expressly agreed to in writing between

 * Synopsys and you.

 * Copyright (c) 2015-2019 Intel Corporation

 *

 * The Software IS NOT an item of Licensed Software or Licensed Product under

 * any End User Software License Agreement or Agreement for Licensed Product

 * with Synopsys or any supplement thereto. You are permitted to use and

 * redistribute this Software in source and binary forms, with or without

 * modification, provided that redistributions of source code must retain this

 * notice. You may not view, use, disclose, copy or distribute this file or

 * any information contained herein except pursuant to this license grant from

 * Synopsys. If you do not agree with this notice, including the disclaimer

 * below, then you are not authorized to use the Software.

 *

 * THIS SOFTWARE IS BEING DISTRIBUTED BY SYNOPSYS SOLELY ON AN "AS IS" BASIS

 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE HEREBY DISCLAIMED. IN NO EVENT SHALL SYNOPSYS BE LIABLE FOR ANY DIRECT,

 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR

 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER

 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH

 * DAMAGE.

 * SPDX-License-Identifier: Apache-2.0

 */

/**

 * @file

 *