hwmon: (nct6775) Fix chip ID for NCT6798D

The chip ID is 0xd42[8-f], not 0xd45[8-f].

Fixes: 0599682b ("hwmon: (nct6775) Add support for NCT6798D")
Reported-by: Michael Cook <mcook@mackal.net>
Cc: Michael Cook <mcook@mackal.net>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>