Add file contexts for SumplementalProcess APEX

Test: flash
Ignore-AOSP-First: feature is developed in internal branch
Change-Id: I586e668a6a77be498965c22af41af63558463a7e
diff --git a/apex/Android.bp b/apex/Android.bp
index faff4a6..bddb639 100644
--- a/apex/Android.bp
+++ b/apex/Android.bp
@@ -244,3 +244,10 @@
     "com.android.car.framework-file_contexts",
   ],
 }
+
+filegroup {
+  name: "com.android.supplementalprocess-file_contexts",
+  srcs: [
+    "com.android.supplementalprocess-file_contexts",
+  ],
+}
diff --git a/apex/com.android.supplementalprocess-file_contexts b/apex/com.android.supplementalprocess-file_contexts
new file mode 100644
index 0000000..9398505
--- /dev/null
+++ b/apex/com.android.supplementalprocess-file_contexts
@@ -0,0 +1 @@
+(/.*)?           u:object_r:system_file:s0