Move notification LED setting down to SYSTEM section.

Bug: 5242350
Change-Id: I4dbefc4e7ba5a19e873c00ba1da84e7a900226cf
diff --git a/res/xml/sound_settings.xml b/res/xml/sound_settings.xml
index a13d6fc..da33d6a 100644
--- a/res/xml/sound_settings.xml
+++ b/res/xml/sound_settings.xml
@@ -64,11 +64,6 @@
             android:persistent="false"
             android:ringtoneType="notification" />
 
-    <CheckBoxPreference
-            android:key="notification_pulse"
-            android:title="@string/notification_pulse_title"
-            android:persistent="false" />
-
     <PreferenceCategory
             android:title="@string/sound_category_feedback_title"/>
 
@@ -94,6 +89,11 @@
             android:title="@string/haptic_feedback_enable_title"
             android:defaultValue="true" />
 
+    <CheckBoxPreference
+            android:key="notification_pulse"
+            android:title="@string/notification_pulse_title"
+            android:persistent="false" />
+
     <ListPreference
             android:key="emergency_tone"
             android:title="@string/emergency_tone_title"