Add temperature sensor.

add a blink_led API (shaves ~1k from GENERIC) rather than have the same
logic in 3 files. Devices register a function to be called to turn the
led on and off based on load average. (Note: rerun conf

add a blink_led API (shaves ~1k from GENERIC) rather than have the same
logic in 3 files. Devices register a function to be called to turn the
led on and off based on load average. (Note: rerun config and make depend)

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driver for "clock-board" (mainly blinky lights, but also has information about the chassis)