Reorder and clean up imports.

Test: rebuild
Change-Id: I178485c84ae7146f991fd77b6d7504b029942a68

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

@@ -16,7 +16,6 @@
 package com.android.settings.notification;
 
 import android.content.Context;
-import androidx.preference.PreferenceViewHolder;
 import android.util.AttributeSet;
 import android.view.View;
 import android.widget.Switch;
@@ -25,6 +24,8 @@ import com.android.settings.R;
 import com.android.settings.widget.MasterSwitchPreference;
 import com.android.settingslib.RestrictedLockUtils;
 
+import androidx.preference.PreferenceViewHolder;
+
 /**
  * Shows an app icon, title and summary. Has a second switch touch target.
  */