Some code formatting

- add some extra lines into those XML layout files

Change-Id: I13c004f23a5c59d46702a93b1cfa7e9b9587b8c2

res/xml/security_settings_lockscreen.xml

@@ -32,6 +32,7 @@
             android:fragment="com.android.settings.OwnerInfoSettings"
             android:title="@string/owner_info_settings_title"
             android:summary="@string/owner_info_settings_summary"/>
+
     </PreferenceCategory>
 
 </PreferenceScreen>

res/xml/security_settings_unencrypted.xml

@@ -28,5 +28,4 @@
     
     </PreferenceCategory>
 
-
 </PreferenceScreen>

res/xml/sim_lock_settings.xml

@@ -23,6 +23,7 @@
             android:title="@string/sim_pin_toggle"
             android:summaryOn="@string/sim_lock_on"
             android:summaryOff="@string/sim_lock_off"/>
+
     <com.android.settings.EditPinPreference
             android:key="sim_pin"
             android:dependency="sim_toggle"
@@ -31,4 +32,5 @@
             android:dialogMessage="@string/sim_enter_old"
             android:positiveButtonText="@string/sim_enter_ok"
             android:negativeButtonText="@string/sim_enter_cancel"/>
-</PreferenceScreen>   
+
+</PreferenceScreen>