Settings: Add private dns icon

<?xml version="1.0" encoding="utf-8"?>

<!--

     SPDX-FileCopyrightText: Material Design Authors / Google LLC

     SPDX-License-Identifier: Apache-2.0

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<vector xmlns:android="http://schemas.android.com/apk/res/android"

    android:width="24dp"

    android:height="24dp"

    android:viewportWidth="24"

    android:viewportHeight="24"

    android:tint="?android:attr/colorControlNormal">

    <path

        android:fillColor="#000000"

        android:pathData="M19,15v4H5v-4h14m1,-2H4c-0.55,0 -1,0.45 -1,1v6c0,0.55 0.45,1 1,1h16c0.55,0 1,-0.45 1,-1v-6c0,-0.55 -0.45,-1 -1,-1zM7,18.5c-0.82,0 -1.5,-0.67 -1.5,-1.5s0.68,-1.5 1.5,-1.5 1.5,0.67 1.5,1.5 -0.67,1.5 -1.5,1.5zM19,5v4H5V5h14m1,-2H4c-0.55,0 -1,0.45 -1,1v6c0,0.55 0.45,1 1,1h16c0.55,0 1,-0.45 1,-1V4c0,-0.55 -0.45,-1 -1,-1zM7,8.5c-0.82,0 -1.5,-0.67 -1.5,-1.5S6.18,5.5 7,5.5s1.5,0.68 1.5,1.5S7.83,8.5 7,8.5z"/>

</vector>

    <com.android.settings.network.PrivateDnsModeDialogPreference

        android:key="private_dns_settings"

        android:title="@string/select_private_dns_configuration_title"

        android:icon="@drawable/ic_settings_private_dns"

        android:order="20"

        android:dialogTitle="@string/select_private_dns_configuration_dialog_title"

        android:dialogLayout="@layout/private_dns_mode_dialog"