Add HAL changes for LANE_KEEP_ASSIST_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: 264946157
Test: atest VtsHalAutomotiveVehicle_TargetTest
Test: atest CtsCarTestCases:CarPropertyManagerTest
Test: atest CtsCarTestCases:VehiclePropertyIdsTest
Test: atest CtsCarTestCases:LaneKeepAssistStateTest
Test: atest AndroidCarApiTest:LaneKeepAssistStateTest
Change-Id: I60ea32b21dc79d692eeb733e4b38deb16a3231f2