Change enabling/disabling procedure for PZT4 Channel to handle the inhibit relay, add autoreseting of PZT4 firmware under some conditions to keep IO-expander in correct state, ramp DAC to correct value when enabling the Piezo Stepper Motor. Add PIEZO_DAC_CHANNEL_NO.RD property in piezo based motors to expose which DAC channel of PZT4 or SIS8300L2 is used by module. Fix seg.fault bug visible for older revision (ABC) of PZT4 hardware.