[Wi-Fi] Support WiFi detail page for OpenRoaming feature in AOSP setting.

Issue: Openroaming should have a specific detail page.
Solution: Apply the mock design to only reserve two preference items:
          1.Auto-connect
          2.Scription details

Bug: 146669261
Test: Add unit test case to test the new controller: WifiSubscriptionDetailPreferenceController2
Change-Id: Iba96500062f412f4cdcd1c8248544657770ab231

src/com/android/settings/wifi/details2/WifiPrivacyPreferenceController2.java

@@ -55,8 +55,11 @@ public class WifiPrivacyPreferenceController2 extends BasePreferenceController i
 
     @Override
     public int getAvailabilityStatus() {
-        return mWifiManager.isConnectedMacRandomizationSupported()
-                ? AVAILABLE : CONDITIONALLY_UNAVAILABLE;
+        if (!mWifiManager.isConnectedMacRandomizationSupported()
+                || mWifiEntry.canManageSubscription()) {
+            return CONDITIONALLY_UNAVAILABLE;
+        }
+        return AVAILABLE;
     }
 
     @Override