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/VibrationPreferenceController.java

@@ -47,7 +47,7 @@ public class VibrationPreferenceController extends NotificationPreferenceControl
             return false;
        }
         return checkCanBeVisible(NotificationManager.IMPORTANCE_DEFAULT)
-                && !NotificationChannel.DEFAULT_CHANNEL_ID.equals(mChannel.getId())
+                && !isDefaultChannel()
                 && mVibrator != null
                 && mVibrator.hasVibrator();
     }