Add HAL changes for SEAT_HEADREST_HEIGHT_POS_V2 and deprecate SEAT_HEADREST_HEIGHT_POS

This deprecation process is for the currently unusable property SEAT_HEADREST_HEIGHT_POS which targets the GLOBAL area type instead of the SEAT area type. This means that changes apply to all seats instead of individual seats. This new property addresses this issue and solves it.

Bug: 242587816
Test: atest VtsHalAutomotiveVehicle_TargetTest
      atest CtsCarTestCases:CarPropertyManagerTest
      atest CtsCarTestCases:VehiclePropertyIdsTest
Change-Id: I1102ffcac6e0c97d73dfc574a5c863a2082d8f3f