Move permissions allowlist for Tethering

The allowlist will now be in the apex instead.

Test: boots && check permissions.xml is bundled
Bug: 190375768

Change-Id: Ia7434cba54d2b51479e52323f22c7f454499991d
diff --git a/Tethering/apex/Android.bp b/Tethering/apex/Android.bp
index 7863572..608f932 100644
--- a/Tethering/apex/Android.bp
+++ b/Tethering/apex/Android.bp
@@ -62,7 +62,10 @@
     apps: [
         "ServiceConnectivityResources",
     ],
-    prebuilts: ["current_sdkinfo"],
+    prebuilts: [
+        "current_sdkinfo",
+        "privapp_allowlist_com.android.tethering",
+    ],
     manifest: "manifest.json",
     key: "com.android.tethering.key",
     // Indicates that pre-installed version of this apex can be compressed.