Port min-feat/dev/fan-controller: split FanController.update() by device.
mici keeps the verbatim upstream 0.11.1 response (OFFSET == 0 there); the older
comma three / three X use the classic pre-0.11.1 curve (setpoint 75) instead of
the +5C setpoint bump, which makes them run hotter with less throttle margin.
Rick Lan
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