Add additional summaries for some restricted switch preferences.

For some of the switch preferences, we need the new summary
"Enabled/Disabled" so that the user know about the switch state but
we can't replace some existing summaries because they provide
context.

Bug: 27659072
Change-Id: I65aca79184f543ef3fc85634594cad75f516d2fa

res/xml/security_settings_misc.xml

@@ -15,6 +15,7 @@
 -->
 
 <PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
+        xmlns:settings="http://schemas.android.com/apk/res/com.android.settings"
         android:title="@string/security_settings_title">
 
     <PreferenceCategory android:key="sim_lock"
@@ -54,7 +55,8 @@
         <com.android.settingslib.RestrictedSwitchPreference android:key="toggle_install_applications"
                 android:title="@string/install_applications"
                 android:summaryOff="@string/install_unknown_applications"
-                android:summaryOn="@string/install_unknown_applications" />
+                android:summaryOn="@string/install_unknown_applications"
+                settings:useAdditionalSummary="true" />
 
     </PreferenceCategory>
 

res/xml/user_settings.xml

@@ -34,7 +34,8 @@
         <com.android.settingslib.RestrictedSwitchPreference
                 android:key="add_users_when_locked"
                 android:title="@string/user_add_on_lockscreen_menu"
-                android:summary="@string/user_add_on_lockscreen_menu_summary" />
+                android:summary="@string/user_add_on_lockscreen_menu_summary"
+                settings:useAdditionalSummary="true" />
     </PreferenceCategory>
     <Preference
         android:key="emergency_info"