Move DhcpServer to NetworkStack app

Test: atest FrameworksNetTests && atest NetworkStackTests
Bug: b/112869080

Change-Id: I96c40e63e9ceb37b67705bdd4d120307e114715b
diff --git a/core/java/android/net/ConnectivityManager.java b/core/java/android/net/ConnectivityManager.java
index 61d5a91..529bb10 100644
--- a/core/java/android/net/ConnectivityManager.java
+++ b/core/java/android/net/ConnectivityManager.java
@@ -2475,6 +2475,8 @@
     public static final int TETHER_ERROR_IFACE_CFG_ERROR      = 10;
     /** {@hide} */
     public static final int TETHER_ERROR_PROVISION_FAILED     = 11;
+    /** {@hide} */
+    public static final int TETHER_ERROR_DHCPSERVER_ERROR     = 12;
 
     /**
      * Get a more detailed error code after a Tethering or Untethering