main: Add copyrights after the code has been modified

Add Huawei copyrights as result of applying our modifications
to the code.

Signed-off-by: Zbigniew Bodek <zbigniew.bodek@huawei.com>

src/config.h

 /*
+ * Copyright (c) 2021 Huawei Inc.
  * Copyright (c) 2017 Intel Corporation
  *
  * SPDX-License-Identifier: Apache-2.0

src/main.c

 /*
+ * Copyright (c) 2021 Huawei Inc.
  * Copyright (c) 2017 Intel Corporation
  *
  * SPDX-License-Identifier: Apache-2.0