hwmon: (via686a) Initialize fan_div values

Functions set_fan_min() and set_fan_div() assume that the fan_div
values have already been read from the register. The driver currently
doesn't initialize them at load time, they are only set when function
via686a_update_device() is called. This means that set_fan_min() and
set_fan_div() misbehave if, for example, "sensors -s" is called
before any monitoring application (e.g. "sensors") is has been run.

Fix the problem by always initializing the fan_div values at device
bind time.

Signed-off-by: Jean Delvare <[email protected]>
Cc: [email protected]
Acked-by: Guenter Roeck <[email protected]>

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