staging: olpc_dcon: Remove I2C_CLASS_DDC support

olpc_dcon is the only remaining i2c client device driver declaring
I2C_CLASS_DDC support after the legacy eeprom driver has been removed.

olpc_dcon is only used on olpc devices, connected to an i2c adapter
driven by scx200_acb. This adapter driver declares support for
I2C_CLASS_HWMON and I2C_CLASS_SPD. Therefore we can safely drop
I2C_CLASS_DDC support in olpc_dcon.

That's the last step before I2C_CLASS_DDC can be removed in general.

This patch is solely based on documentation, and I don't have an olpc
device for testing. Therefore some testing would be appreciated before
patch is applied.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Link: https://lore.kernel.org/r/da3070d9-e016-4167-843f-a08d5b2dc1fe@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/olpc_dcon/olpc_dcon.c

@@ -777,7 +777,7 @@ static struct i2c_driver dcon_driver = {
 		.name	= "olpc_dcon",
 		.pm = &dcon_pm_ops,
 	},
-	.class = I2C_CLASS_DDC | I2C_CLASS_HWMON,
+	.class = I2C_CLASS_HWMON,
 	.id_table = dcon_idtable,
 	.probe = dcon_probe,
 	.remove = dcon_remove,