Allow setting supported values for reference VHAL.

Debug command in reference VHAL now allows setting supported values
for all properties that specify hasSupportedValuesList to true.

We also introduce a new field "supportedValues" in the fake VHAL
JSON config to allow specifying the initial supported values. If
this field is not specified, we will fallback to use
supportedEnumValues field.

This CL add supportedValues field to HVAC_TEMP_SET and
EV_CHARGE_PERCENT_LIMIT to demonstrate how it may be used.

Flag: EXEMPT VHAL
Test: atest FakeVehicleHardwareTest
Bug: 394692817
Change-Id: I5f602d596360732e2142d691dcce907d6786d7bf