Add biometric face virtual hal service

Bug: 228638448
Test: Manually following face virtual hal provisioning procedure
Change-Id: I1f61b687be4abe53c62c21769fb57dc9cf9daf45
diff --git a/private/service_contexts b/private/service_contexts
index c5d8082..4067741 100644
--- a/private/service_contexts
+++ b/private/service_contexts
@@ -24,6 +24,7 @@
 android.hardware.automotive.remoteaccess.IRemoteAccess/default       u:object_r:hal_remoteaccess_service:s0
 android.hardware.automotive.vehicle.IVehicle/default                 u:object_r:hal_vehicle_service:s0
 android.hardware.biometrics.face.IFace/default                       u:object_r:hal_face_service:s0
+android.hardware.biometrics.face.IFace/virtual                       u:object_r:hal_face_service:s0
 android.hardware.biometrics.fingerprint.IFingerprint/default         u:object_r:hal_fingerprint_service:s0
 android.hardware.biometrics.fingerprint.IFingerprint/virtual         u:object_r:hal_fingerprint_service:s0
 android.hardware.bluetooth.IBluetoothHci/default                     u:object_r:hal_bluetooth_service:s0