The GSC fan pwm temperature register is in centidegrees celcius but the
Linux hwmon convention is to use milidegrees celcius. Fix the scaling.

Fixes: 3bce5377 ("hwmon: Add Gateworks System Controller support")
Signed-off-by: Tim Harvey <tharvey@gateworks.com>
Link: https://lore.kernel.org/r/20230606153004.1448086-1-tharvey@gateworks.comSigned-off-by: Guenter Roeck <linux@roeck-us.net>