Add PolicyDirection InfDef annotation to IpSecManager

IpSec is going to be moved into Connectivity module and it needs to
use PolicyDirection annotation. Add PolicyDirection IntDef annotation
so that it can be used in the module.

Bug: 204153604
Test: FrameworksNetTests
Change-Id: Ib411d8c436d67574bfaf7f3aba43e5f31e7487e2

framework-t/src/android/net/IpSecManager.java

@@ -17,6 +17,7 @@ package android.net;
 
 import static android.annotation.SystemApi.Client.MODULE_LIBRARIES;
 
+import android.annotation.IntDef;
 import android.annotation.NonNull;
 import android.annotation.RequiresFeature;
 import android.annotation.RequiresPermission;
@@ -25,7 +26,6 @@ import android.annotation.SystemService;
 import android.annotation.TestApi;
 import android.content.Context;
 import android.content.pm.PackageManager;
-import android.net.annotations.PolicyDirection;
 import android.os.Binder;
 import android.os.ParcelFileDescriptor;
 import android.os.RemoteException;
@@ -41,6 +41,8 @@ import dalvik.system.CloseGuard;
 
 import java.io.FileDescriptor;
 import java.io.IOException;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
 import java.net.DatagramSocket;
 import java.net.InetAddress;
 import java.net.Socket;
@@ -88,6 +90,11 @@ public final class IpSecManager {
     @SystemApi(client = MODULE_LIBRARIES)
     public static final int DIRECTION_FWD = 2;
 
+    /** @hide */
+    @IntDef(value = {DIRECTION_IN, DIRECTION_OUT})
+    @Retention(RetentionPolicy.SOURCE)
+    public @interface PolicyDirection {}
+
     /**
      * The Security Parameter Index (SPI) 0 indicates an unknown or invalid index.
      *