staging: iio: hmc5843: Set iio name property in sysfs

Without this change file name for hmc5843 is empty in
/sys/bus/iio/devices/iio\:device*/name

With this change name is reported correctly:
cat /sys/bus/iio/devices/iio\:device*/name
hmc5843
Signed-off-by: Marek Belisko <marek@goldelico.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

drivers/staging/iio/magnetometer/hmc5843_core.c

@@ -592,6 +592,7 @@ int hmc5843_common_probe(struct device *dev, struct regmap *regmap,
 	mutex_init(&data->lock);
 
 	indio_dev->dev.parent = dev;
+	indio_dev->name = dev->driver->name;
 	indio_dev->info = &hmc5843_info;
 	indio_dev->modes = INDIO_DIRECT_MODE;
 	indio_dev->channels = data->variant->channels;