iio: chemical: bme680: Switch from of headers to mod_devicetable.h

There is nothing directly using of specific interfaces in this driver,
so lets not include the headers.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20220203122725.75939-1-andriy.shevchenko@linux.intel.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/chemical/bme680_spi.c

@@ -4,8 +4,8 @@
  *
  * Copyright (C) 2018 Himanshu Jha <himanshujha199640@gmail.com>
  */
+#include <linux/mod_devicetable.h>
 #include <linux/module.h>
-#include <linux/of.h>
 #include <linux/regmap.h>
 #include <linux/spi/spi.h>