hwmon: (nct6683) Support NCT6686D

Add support for NCT6686D chip used in the Lenovo P620.

Signed-off-by: Jiqi Li <lijq9@lenovo.com>
Reviewed-by: Mark Pearson <markpearson@lenovo.com>
Link: https://lore.kernel.org/r/20210304104421.1912934-1-lijq9@lenovo.com


Signed-off-by: Guenter Roeck <linux@roeck-us.net>