Add a few pages to search index.

- Data saver
- A few special permission access pages
   - Picture-in-picture
   - Premium sms
   - do not disturb access
- And a unrelated cleanup: move EmptyTextFragment from
  notification/ to widget/

Bug: 70720645
Test: robotests
Change-Id: I6a87f712bf81f9fd32fa9a3826fba851ca748409
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 3c635eb..dba61d6 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -2438,7 +2438,7 @@
                 <category android:name="android.intent.category.DEFAULT" />
             </intent-filter>
             <meta-data android:name="com.android.settings.FRAGMENT_CLASS"
-                android:value="com.android.settings.applications.appinfo.PictureInPictureSettings" />
+                android:value="com.android.settings.applications.specialaccess.pictureinpicture.PictureInPictureSettings" />
         </activity>
 
         <activity
@@ -2452,7 +2452,7 @@
                 <data android:scheme="package" />
             </intent-filter>
             <meta-data android:name="com.android.settings.FRAGMENT_CLASS"
-                android:value="com.android.settings.applications.appinfo.PictureInPictureDetails" />
+                android:value="com.android.settings.applications.specialaccess.pictureinpicture.PictureInPictureDetails" />
         </activity>
 
         <activity