Update Settings tests to new DeviceStateManager API

Updates tests that use PosturesHelper to return both
the correct configuration values as well as the values
returned through the DeviceStateManager APIs

Flag: android.hardware.devicestate.feature.flags.device_state_property_migration
Bug: 336640888
Test: atest SettingsRoboTests
Change-Id: I23e7446de719f11c99a4f747e189e11405b203ef