hwmon: (k10temp) 27C Offset needed for Threadripper2

For at least the Threadripper 2950X and Threadripper 2990WX,
it's confirmed a 27 degree offset is needed.

Signed-off-by: Michael Larabel <michael@phoronix.com>
Cc: stable@vger.kernel.org
Signed-off-by: Guenter Roeck <linux@roeck-us.net>