drivers/adau7002: Fix include file

Add missing license and include guard and remove unneeded include.

BUG=b:72121803
TEST=compiles

Change-Id: Ic359ed262086596a98131669f8eecd531857187a
Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>
Reviewed-on: https://review.coreboot.org/23721
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>

src/drivers/generic/adau7002/chip.h

@@ -1,4 +1,22 @@
-#include <arch/acpi_device.h>
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2018 Google LLC
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef __I2C_GENERIC_ADAU7002_CHIP_H__
+#define __I2C_GENERIC_ADAU7002_CHIP_H__
 
 struct drivers_generic_adau7002_config {
 };
+
+#endif /* __I2C_GENERIC_ADAU7002_CHIP_H__ */