iio: imu: adis16480: remove duplicated include from adis16480.c

Remove duplicated include.
Signed-off-by: NWei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

drivers/iio/imu/adis16480.c

@@ -24,7 +24,6 @@
 #include <linux/iio/buffer.h>
 #include <linux/iio/imu/adis.h>
 
-#include <linux/iio/iio.h>
 #include <linux/debugfs.h>
 
 #define ADIS16480_PAGE_SIZE 0x80