Virtual Face: use file_contexts in system/sepolicy

Bug: 387192232
Test: m com.android.hardware.biometrics.face.virtual
Change-Id: If0cfc56c22a7c6f315b860cf565ba8f79902e203
diff --git a/biometrics/face/aidl/default/apex/Android.bp b/biometrics/face/aidl/default/apex/Android.bp
index c4632d4..0561145 100644
--- a/biometrics/face/aidl/default/apex/Android.bp
+++ b/biometrics/face/aidl/default/apex/Android.bp
@@ -19,7 +19,7 @@
 apex {
     name: "com.android.hardware.biometrics.face.virtual",
     manifest: "manifest.json",
-    file_contexts: "file_contexts",
+    file_contexts: ":com.android.biometrics.virtual.face-file_contexts",
     key: "com.android.hardware.key",
     certificate: ":com.android.hardware.certificate",
     updatable: false,