iio: dac: max5821: Drop unused i2c driver data

The .driver_data member of the single i2c_device_id array entry is
unused in the driver. Drop it and also the then unused definition.

While at it, convert the i2c_device_id array to a better readable named
initializer.

Signed-off-by: Uwe Kleine-König (The Capable Hub) <u.kleine-koenig@baylibre.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

Author: ukleinek

drivers/iio/dac/max5821.c

@@ -26,10 +26,6 @@
 #define MAX5821_EXTENDED_DAC_A			0x04
 #define MAX5821_EXTENDED_DAC_B			0x08
 
-enum max5821_device_ids {
-	ID_MAX5821,
-};
-
 struct max5821_data {
 	struct i2c_client	*client;
 	unsigned short		vref_mv;
@@ -332,7 +328,7 @@ static int max5821_probe(struct i2c_client *client)
 }
 
 static const struct i2c_device_id max5821_id[] = {
-	{ "max5821", ID_MAX5821 },
+	{ .name = "max5821" },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, max5821_id);