hwmon: (adt7475) Add support for configuring initial PWM state

By default the PWM duty cycle in hardware is 100%. On some systems this
can cause unwanted fan noise. Add the ability to specify the fan
connections and initial state of the PWMs via device properties.

Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
Link: https://lore.kernel.org/r/20240722221737.3407958-4-chris.packham@alliedtelesis.co.nz


[groeck: Cleaned up formatting]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>