hwmon: (lm87) Remove unused I2C devices driver_data

The I2C device ID entries set a .driver_data but this data is never
looked up by the driver. So don't set it and also remove the enum.

Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>