Remove TcpRepairWindow from module-lib API

Both TcpRepairWindow and TcpKeepaliveController(user) are in the
connectivity module, so TcpRepairWindow doesn't need to be
the module-lib API. Thus, remove TcpRepairWindow from
module-lib API.

Bug: 172183305
Test: m update-api
Change-Id: I8fde726f8ad73637e6deab69ea83b3699bb2cf45

framework/src/android/net/TcpRepairWindow.java

@@ -16,15 +16,12 @@
 
 package android.net;
 
-import android.annotation.SystemApi;
-
 /**
  * Corresponds to C's {@code struct tcp_repair_window} from
  * include/uapi/linux/tcp.h
  *
  * @hide
  */
-@SystemApi(client = SystemApi.Client.MODULE_LIBRARIES)
 public final class TcpRepairWindow {
     public final int sndWl1;
     public final int sndWnd;