sepolicy: Add filegroup for wifi apex

Bug: 146163587
Test: atest wifi_e2e_tests
Change-Id: I4238f585fb535f163e39a7ac1c61cb04bb15eacd
diff --git a/apex/Android.bp b/apex/Android.bp
index 19a44c7..6caeb0c 100644
--- a/apex/Android.bp
+++ b/apex/Android.bp
@@ -145,3 +145,10 @@
     "com.android.vndk-file_contexts",
   ],
 }
+
+filegroup {
+  name: "com.android.wifi-file_contexts",
+  srcs: [
+    "com.android.wifi-file_contexts",
+  ],
+}