Move wifiservice into its own package

Change-Id: I3ff378a29cb4dd191605b0b641147eba1f445d13
diff --git a/services/java/com/android/server/SystemServer.java b/services/java/com/android/server/SystemServer.java
index 949c2ed..8ef247e6 100644
--- a/services/java/com/android/server/SystemServer.java
+++ b/services/java/com/android/server/SystemServer.java
@@ -62,6 +62,7 @@
 import com.android.server.power.ShutdownThread;
 import com.android.server.search.SearchManagerService;
 import com.android.server.usb.UsbService;
+import com.android.server.wifi.WifiService;
 import com.android.server.wm.WindowManagerService;
 
 import dalvik.system.VMRuntime;