Use APk-in-APEX for PermissionController.

Bug: 136503238
Test: m mts && mts-tradefed run mts-permission
Change-Id: I281150603798156ef5f25fbce4b7eee1a4cae82a
diff --git a/Android.bp b/Android.bp
index 5945fb3..f232e62 100644
--- a/Android.bp
+++ b/Android.bp
@@ -22,6 +22,7 @@
     name: "com.android.permission-defaults",
     key: "com.android.permission.key",
     certificate: ":com.android.permission.certificate",
+    apps: ["PermissionController"],
 }
 
 apex_key {