meta-ethanolx: Support AST2500 internal ADC sensor

Populate ADC sensor data to the system. This change make ADC data
accessible over DBus, IPMI, Redfish and webui-vue.

The threshold values were calculated as 10% from the target values.

The "PowerState: On" entity-manager parameter on the "*_RUN" channels
is used to make thresholds active only when the board is powered on.

Signed-off-by: Konstantin Aladyshev <aladyshev22@gmail.com>
Change-Id: I5322e83fdbfa0815bed454ea81b83725a2221d2c