iio: accel: bma220_spi: set up buffer timestamps for non-zero values

Use the iio_pollfunc_store_time parameter during triggered buffer
set-up to get valid timestamps.
Signed-off-by: NAlison Schofield <amsfield22@gmail.com>
Cc: Daniel Baluta <daniel.baluta@gmail.com>
Reviewed-By: NTiberiu Breana <tiberiu.a.breana@intel.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

drivers/iio/accel/bma220_spi.c

@@ -253,7 +253,7 @@ static int bma220_probe(struct spi_device *spi)
 	if (ret < 0)
 		return ret;
 
-	ret = iio_triggered_buffer_setup(indio_dev, NULL,
+	ret = iio_triggered_buffer_setup(indio_dev, iio_pollfunc_store_time,
 					 bma220_trigger_handler, NULL);
 	if (ret < 0) {
 		dev_err(&spi->dev, "iio triggered buffer setup failed\n");