To avoid "asm/dma-mapping.h: No such file or directory" error,
we need something.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
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+/* SPDX-License-Identifier: GPL-2.0-only */
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+/* SPDX-License-Identifier: GPL-2.0-only */
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+/* SPDX-License-Identifier: GPL-2.0-only */
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+/* SPDX-License-Identifier: GPL-2.0-only */
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+/* SPDX-License-Identifier: GPL-2.0-only */
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+/* SPDX-License-Identifier: GPL-2.0-only */
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+/* SPDX-License-Identifier: GPL-2.0-only */
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+/* SPDX-License-Identifier: GPL-2.0-only */