training: Modify dev platform to use physical sensor and fan

[kurtjd]

Modify one of the development platforms (which currently use mock hardware) to use a real TMP108 temperature sensor and PWM controlled fan. This is for practice only and not intended to be PRd.

[kurtjd]

@bjackson312006 (FYI as we discussed)

[kurtjd]

@bjackson312006 Feel free to close this whenever you feel like you have a good handle of how real drivers plug into our services.