fix ethernet and wifi can't be tuned seperately issue

ethernet especially Gigabit enet use the same tune data with wifi
won't reach best performance.

Change-Id: Iac50ba47904c76ff7b5b8ad226e83451359ec534
Signed-off-by: Jianzheng Zhou <jianzheng.zhou@freescale.com>

core/java/android/net/EthernetDataTracker.java

@@ -403,7 +403,7 @@ public class EthernetDataTracker implements NetworkStateTracker {
      * for this network.
      */
     public String getTcpBufferSizesPropName() {
-        return "net.tcp.buffersize.wifi";
+        return "net.tcp.buffersize.ethernet";
     }
 
     public void setDependencyMet(boolean met) {