Add required permission to Tethering

The permission of Tethering is moved to a separate xml file,
add the xml module to the required field of tethering app.

Bug: 151213404
Test: TetheringTests
Ignore-AOSP-First: merge conflict resolutions
Change-Id: I40b45a0f1b44fba0b68e94811d14725a59ed4e59

Tethering/Android.bp

@@ -146,7 +146,10 @@ android_app {
     manifest: "AndroidManifest.xml",
     use_embedded_native_libs: true,
     // The permission configuration *must* be included to ensure security of the device
-    required: ["NetworkPermissionConfig"],
+    required: [
+        "NetworkPermissionConfig",
+        "privapp_whitelist_com.android.networkstack.tethering",
+    ],
     apex_available: ["com.android.tethering"],
     min_sdk_version: "30",
 }