Allow the user to change the BackupTransport

Set the following config overlays to activate this feature:

* config_backup_settings_intent to settings://com.android.settings.backup.transport
* config_backup_settings_label to some user-facing label
  e.g. Change backup provider

Squashed with:

Author: Michael Bestas <mkbestas@lineageos.org>
Date:   Wed Nov 18 16:08:44 2020 +0200

    Backup: Don't hardcode ignored backup transports

    * Allow extending the ignored backup transport list
      by moving it to an overlay
    * Set config_ignored_backup_transports to override

    Change-Id: If4ccad0acac708cac272f791392f9ac827a7491f

Change-Id: I080d96e2c34045a0e61f3fa1b839f463550f2028
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index a8e0390..1a24714 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -4487,6 +4487,18 @@
             </intent-filter>
         </activity>
 
+        <activity android:name=".backup.transport.TransportActivity"
+                  android:label="@string/backup_transport_title"
+                  android:icon="@drawable/ic_settings_backup"
+                  android:exported="false">
+            <intent-filter>
+                <action android:name="android.intent.action.VIEW" />
+                <category android:name="android.intent.category.DEFAULT" />
+                <data android:scheme="settings"
+                      android:host="com.android.settings.backup.transport" />
+            </intent-filter>
+        </activity>
+
         <!-- This is the longest AndroidManifest.xml ever. -->
     </application>
 </manifest>