Support up to two SuperIO chips in the same system

Support both SuperIO chips on SuperMicro C7H61-O.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Enable both VIN3 and AUXTIN

Both are reported at the same time on SuperMicro C7H61.

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