Add preference for WiFi MAC randomization.

Preference visibility contolled by feature flag -
settings_wifi_mac_randomization.

Bug: 1227787
Test: RunSettingsRoboTests

Change-Id: Ibad8d3ea2bfa3879acc1ec883b8c03f1979bde45

res/values/arrays.xml

@@ -1081,6 +1081,11 @@
         <item>Treat as unmetered</item>
     </string-array>
 
+    <string-array name="wifi_privacy_entries">
+        <item>Default (use randomized MAC)</item>
+        <item>Trusted</item>
+    </string-array>
+
     <string-array name="wifi_hidden_entries">
         <item>No</item>
         <item>Yes</item>
@@ -1092,6 +1097,11 @@
         <item>2</item>
     </string-array>
 
+    <string-array name="wifi_privacy_values" translatable="false">
+        <item>0</item>
+        <item>1</item>
+    </string-array>
+
     <!-- Titles for ui dark mode preference. -->
     <string-array name="dark_ui_mode_entries" >
         <item>Automatic (based on time of day)</item>