Add file contexts for OnDevicePersonalization module.

Test: Build
Bug: b/218749359
Ignore-AOSP-First: this feature is still under development.
Change-Id: Ib69e8e7098913e14b9973c65b37c88daa98b4e06
diff --git a/apex/Android.bp b/apex/Android.bp
index 01d57c8..256eb3e 100644
--- a/apex/Android.bp
+++ b/apex/Android.bp
@@ -270,3 +270,10 @@
     "com.android.auxiliary-file_contexts",
   ],
 }
+
+filegroup {
+  name: "com.android.ondevicepersonalization-file_contexts",
+  srcs: [
+    "com.android.ondevicepersonalization-file_contexts",
+  ],
+}