DHCP: Add a hidden setting to use the legacy DHCP client.

Change-Id: I5505bd2c20ddc895df0e9b176e1ed770ad74a3f4
diff --git a/core/java/android/provider/Settings.java b/core/java/android/provider/Settings.java
index d773d4a..2647247 100644
--- a/core/java/android/provider/Settings.java
+++ b/core/java/android/provider/Settings.java
@@ -5436,6 +5436,14 @@
                "hdmi_control_auto_device_off_enabled";
 
        /**
+        * Whether to use the DHCP client from Lollipop and earlier instead of the newer Android DHCP
+        * client.
+        * (0 = false, 1 = true)
+        * @hide
+        */
+       public static final String LEGACY_DHCP_CLIENT = "legacy_dhcp_client";
+
+       /**
         * Whether TV will switch to MHL port when a mobile device is plugged in.
         * (0 = false, 1 = true)
         * @hide