Add HAL changes for BLIND_SPOT_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: 264946039
Test: atest VtsHalAutomotiveVehicle_TargetTest
Test: atest CtsCarTestCases:CarPropertyManagerTest
Test: atest CtsCarTestCases:VehiclePropertyIdsTest
Test: atest CtsCarTestCases:BlindSpotWarningStateTest
Test: atest AndroidCarApiTest:BlindSpotWarningStateTest
Change-Id: Idc64af44ecdf33ee5c89d3bf7d303498d80a0d14