Fix: Prevent boot crash on foldable devices with missing auto-rotate config

The logic introduced in ag/34327514 causes devices to crash during boot if they are foldable, have auto-rotate enabled, and lack the `config_perDeviceStateRotationLockDefaults` configuration.

The current behavior is problematic because `config_perDeviceStateRotationLockDefaults` is an optional setting for device state-based auto-rotate.
A device should boot and function normally regardless of whether this optional setting is present.

To resolve this, the logic is updated to initialize device state-based auto-rotate classes only when config_perDeviceStateRotationLockDefaults is present and not empty.

Test: atest DisplayRotationTests DeviceStateAutoRotateSettingManagerProviderTest
Fixes: 431045703
Flag: EXEMPT bugfix
Change-Id: I53ac476987af89608fd5e6a5724a4926612f7951