mock wifi (nl80211-framework#2): new constructor for mocking WifiNl80211Manager

To mock WifiNl80211Manager, it requires to have a new constructor to
inject the mocked IWificond binder for mocking WifiNl80211Manager
instance.

Bug: 251763354
Test: Manual test
Change-Id: I427696a26d611a9405fba1f478acef0ac6755b27

core/api/system-current.txt

@@ -9313,6 +9313,7 @@ package android.net.wifi.nl80211 {
   }
 
   public class WifiNl80211Manager {
+    ctor public WifiNl80211Manager(@NonNull android.content.Context, @NonNull android.os.IBinder);
     method public void abortScan(@NonNull String);
     method public void enableVerboseLogging(boolean);
     method @NonNull public int[] getChannelsMhzForBand(int);

wifi/java/src/android/net/wifi/nl80211/WifiNl80211Manager.java

@@ -393,6 +393,21 @@ public class WifiNl80211Manager {
         mEventHandler = new Handler(context.getMainLooper());
     }
 
+    /**
+     * Construct WifiNl80211Manager with giving context and binder which is an interface of
+     * IWificond.
+     *
+     * @param context Android context.
+     * @param binder a binder of IWificond.
+     */
+    public WifiNl80211Manager(@NonNull Context context, @NonNull IBinder binder) {
+        this(context);
+        mWificond = IWificond.Stub.asInterface(binder);
+        if (mWificond == null) {
+            Log.e(TAG, "Failed to get reference to wificond");
+        }
+    }
+
     /** @hide */
     @VisibleForTesting
     public WifiNl80211Manager(Context context, IWificond wificond) {