Introduce ignition state property in VHAL

Bug: b/32312972

Test: added tests in Car Service (another CL), also this property
      should be veirified in VTS
Change-Id: I3531227f2f12806a67926cfd930547df54475991
diff --git a/vehicle/2.0/default/impl/DefaultConfig.h b/vehicle/2.0/default/impl/DefaultConfig.h
index e4ca5ca..5b6a9b7 100644
--- a/vehicle/2.0/default/impl/DefaultConfig.h
+++ b/vehicle/2.0/default/impl/DefaultConfig.h
@@ -167,6 +167,12 @@
                 .maxInt32Value = 10
             }
         }
+    },
+
+    {
+        .prop = VehicleProperty::IGNITION_STATE,
+        .access = VehiclePropertyAccess::READ,
+        .changeMode = VehiclePropertyChangeMode::ON_CHANGE,
     }
 };