Add sepolicy for com.android.compos

This is to unblock the apex setup.

There is only a system_file in the context, but we might need more
specific ones later.

Bug: 186126404
Test: m

Change-Id: Icf713c9bb92e7f7402c0b45bd0f1b06e9cb35d2b
diff --git a/apex/Android.bp b/apex/Android.bp
index 2ffaa9e..b5199f0 100644
--- a/apex/Android.bp
+++ b/apex/Android.bp
@@ -71,6 +71,13 @@
 }
 
 filegroup {
+  name: "com.android.compos-file_contexts",
+  srcs: [
+    "com.android.compos-file_contexts",
+  ],
+}
+
+filegroup {
   name: "com.android.conscrypt-file_contexts",
   srcs: [
     "com.android.conscrypt-file_contexts",