Clean up de hidl flagged code

1. Remove all HIDL specific clients & providers
2. Remove flag dependent conditionals
3. Remove BiometricService#subscribe(OperationContextExt, Consumer) API
4. Remove UserAwareBiometricScheduler

Test: atest FingerprintSensorConfigurationsTest FaceSensorConfigurationsTest AuthServiceTest FaceServiceTest FingerprintServiceTest FaceProviderTest FingerprintProviderTest HidlToAidlSensorAdapterTest HidlToAidlSessionAdapterTest SensorTest BiometricSchedulerTest BiometricContextProviderTest
Fixes: 331252276
Change-Id: Ie761a1ad9a31d91d81753cee7851849821899f0a