Add HAL changes for FORWARD_COLLISION_WARNING_STATE

This property supports error states in addition to its own state.
This is why the comments mention two @data_enums for this property.
This works because states are integer values so as long as all states
have distinct integer values, this functions correctly.

Bug: 264946034
Test: atest VtsHalAutomotiveVehicle_TargetTest
Test: atest CtsCarTestCases:CarPropertyManagerTest
Test: atest CtsCarTestCases:VehiclePropertyIdsTest
Test: atest ForwardCollisionWarningStateTest
Change-Id: Ib9292d8e64cc0d404065efccbfcf7fabd9fd1f69