ferrochrome: Add privapp permissions allowlist

Test: m, boot
Change-Id: I427652fe5d9f8da0055be13eaccd96a1840891cf
diff --git a/ferrochrome_app/Android.bp b/ferrochrome_app/Android.bp
index 29a16d0..9f0c735 100644
--- a/ferrochrome_app/Android.bp
+++ b/ferrochrome_app/Android.bp
@@ -11,7 +11,17 @@
     system_ext_specific: true,
     privileged: true,
     init_rc: ["custom_vm_setup.rc"],
-    required: ["custom_vm_setup"],
+    required: [
+        "custom_vm_setup",
+        "privapp-permissions-ferrochrome.xml",
+    ],
+}
+
+prebuilt_etc {
+    name: "privapp-permissions-ferrochrome.xml",
+    src: "privapp-permissions-ferrochrome.xml",
+    sub_dir: "permissions",
+    system_ext_specific: true,
 }
 
 sh_binary {