Notification settings updates

- smaller icons
- text update
- fx header
- fix category header

Test: make -j RunSettingsRoboTests

Change-Id: If822d6db31a8dccf20ee88182cda1aee34aa7675
Fixes: 77325154
Fixes: 77323406
Fixes: 77324677
Fixes: 74408368

src/com/android/settings/notification/SoundPreferenceController.java

@@ -59,8 +59,7 @@ public class SoundPreferenceController extends NotificationPreferenceController
         if (mChannel == null) {
             return false;
         }
-        return checkCanBeVisible(NotificationManager.IMPORTANCE_DEFAULT)
-                && !NotificationChannel.DEFAULT_CHANNEL_ID.equals(mChannel.getId());
+        return checkCanBeVisible(NotificationManager.IMPORTANCE_DEFAULT) && !isDefaultChannel();
     }
 
     @Override