Update PosturesHelper to use DeviceStateManager API's

PosturesHelper updated to use the DeviceStateManager API's
to determine what states map to being folded/unfolded etc
instead of using the config overlay values

Bug: 336640888
Test: PosturesHelperTest
Test: DeviceStateRotationLockSettingControllerTest
Test: DeviceStateRotationLockSettingsManagerTest
Flag: android.hardware.devicestate.feature.flags.device_state_property_migration
Change-Id: I6280934063e49658b129d0405f8d5feb71ff4901