iio: adis16260: make use of adis lock helpers

Use the adis lib lock helpers to lock the device. This makes things
consistent with other users of the library.
Signed-off-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20210520115909.466275-2-nuno.sa@analog.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/gyro/adis16260.c

@@ -293,7 +293,7 @@ static int adis16260_write_raw(struct iio_dev *indio_dev,
 		addr = adis16260_addresses[chan->scan_index][1];
 		return adis_write_reg_16(adis, addr, val);
 	case IIO_CHAN_INFO_SAMP_FREQ:
-		mutex_lock(&adis->state_lock);
+		adis_dev_lock(adis);
 		if (spi_get_device_id(adis->spi)->driver_data)
 			t = 256 / val;
 		else
@@ -310,7 +310,7 @@ static int adis16260_write_raw(struct iio_dev *indio_dev,
 			adis->spi->max_speed_hz = ADIS16260_SPI_FAST;
 		ret = __adis_write_reg_8(adis, ADIS16260_SMPL_PRD, t);
 
-		mutex_unlock(&adis->state_lock);
+		adis_dev_unlock(adis);
 		return ret;
 	}
 	return -EINVAL;