hwmon/pc87360: Autodetect the VRM version

pc87360 currently hardcodes vrm = 90 (2.4 vintage).  Update it to use
newer code in hwmon-vid which reads cpuid to determine the correct vid.

Signed-off-by: Jim Cromie <jim.cromie@gmail.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>