Add install support for WIFI UID

Bug: 8472221
Change-Id: If203760fc960b4d8987d745e49ef1d4355c45adf
diff --git a/res/xml/wifi_advanced_settings.xml b/res/xml/wifi_advanced_settings.xml
index 4319ec6..d250585 100644
--- a/res/xml/wifi_advanced_settings.xml
+++ b/res/xml/wifi_advanced_settings.xml
@@ -53,6 +53,11 @@
             android:entryValues="@array/wifi_frequency_band_values"
             />
 
+    <Preference
+            android:key="install_credentials"
+            android:title="@string/wifi_install_credentials"
+            android:persistent="false" />
+
     <CheckBoxPreference
             android:key="suspend_optimizations"
             android:title="@string/wifi_suspend_optimizations"