Define detailed not available status.

This allows the property status to be consistent with the
not-available status code. These new property status will allow
vendor to expose a more detailed property status to the app.

Flag: EXEMPT HAL interface
Test: m android.hardware.automotive.vehicle-update-api
Bug: 381125615
Change-Id: Ib1fcbe4057ed1a981b635227dcb20c30397d2245