LP-584 Fix ADC on servo outputs

Branch: mindnever/librepilot:LP-584_Fix_ADC_on_servo_outputs
Branch: librepilot/librepilot:next
Merged
Merged pull request
Merged in mindnever/librepilot/LP-584_Fix_ADC_on_servo_outputs (pull request #500)
Description
Fix servo driver to not touch unused pins in _disable() function. Fix adc channel for servo6 on revolution & sparky2 targets.