[DO NOT MERGE] - Hide Tunnel Mode IpSec API

Hide the tunnel mode of the IpSec API because
there is a disincentive to launch it without
a supported customer use case. That use case,
IWLAN is having its APIs hidden, so we should
hide these as well to avoid constraining future
implementation.

Also, due to issues with the lifetime of the NATT
management object, this API needs to be hidden
until such time as the lifetime of the Keepalive
can be handled independently of the lifetime of
a Transform.

Bug: 72523623
Test: compilation (api removal)
Change-Id: I076030bdbab1cd7d69f6a034577d529970b050dc

core/java/android/net/IpSecManager.java

@@ -20,7 +20,6 @@ import static com.android.internal.util.Preconditions.checkNotNull;
 import android.annotation.IntDef;
 import android.annotation.NonNull;
 import android.annotation.RequiresPermission;
-import android.annotation.SystemApi;
 import android.annotation.SystemService;
 import android.annotation.TestApi;
 import android.content.Context;
@@ -666,7 +665,6 @@ public final class IpSecManager {
      * to create Network objects which are accessible to the Android system.
      * @hide
      */
-    @SystemApi
     public static final class IpSecTunnelInterface implements AutoCloseable {
         private final String mOpPackageName;
         private final IIpSecService mService;
@@ -693,7 +691,6 @@ public final class IpSecManager {
          * @param prefixLen length of the InetAddress prefix
          * @hide
          */
-        @SystemApi
         @RequiresPermission(android.Manifest.permission.MANAGE_IPSEC_TUNNELS)
         public void addAddress(@NonNull InetAddress address, int prefixLen) throws IOException {
             try {
@@ -713,7 +710,6 @@ public final class IpSecManager {
          * @param prefixLen length of the InetAddress prefix
          * @hide
          */
-        @SystemApi
         @RequiresPermission(android.Manifest.permission.MANAGE_IPSEC_TUNNELS)
         public void removeAddress(@NonNull InetAddress address, int prefixLen) throws IOException {
             try {
@@ -809,7 +805,6 @@ public final class IpSecManager {
      * @throws ResourceUnavailableException indicating that too many encapsulation sockets are open
      * @hide
      */
-    @SystemApi
     @NonNull
     @RequiresPermission(android.Manifest.permission.MANAGE_IPSEC_TUNNELS)
     public IpSecTunnelInterface createIpSecTunnelInterface(@NonNull InetAddress localAddress,
@@ -836,7 +831,6 @@ public final class IpSecManager {
      *         layer failure.
      * @hide
      */
-    @SystemApi
     @RequiresPermission(android.Manifest.permission.MANAGE_IPSEC_TUNNELS)
     public void applyTunnelModeTransform(@NonNull IpSecTunnelInterface tunnel,
             @PolicyDirection int direction, @NonNull IpSecTransform transform) throws IOException {

core/java/android/net/IpSecTransform.java

@@ -22,7 +22,6 @@ import static com.android.internal.util.Preconditions.checkNotNull;
 import android.annotation.IntDef;
 import android.annotation.NonNull;
 import android.annotation.RequiresPermission;
-import android.annotation.SystemApi;
 import android.content.Context;
 import android.os.Binder;
 import android.os.Handler;
@@ -250,7 +249,6 @@ public final class IpSecTransform implements AutoCloseable {
      *
      * @hide
      */
-    @SystemApi
     public static class NattKeepaliveCallback {
         /** The specified {@code Network} is not connected. */
         public static final int ERROR_INVALID_NETWORK = 1;
@@ -281,7 +279,6 @@ public final class IpSecTransform implements AutoCloseable {
      *
      * @hide
      */
-    @SystemApi
     @RequiresPermission(anyOf = {
             android.Manifest.permission.MANAGE_IPSEC_TUNNELS,
             android.Manifest.permission.PACKET_KEEPALIVE_OFFLOAD
@@ -324,7 +321,6 @@ public final class IpSecTransform implements AutoCloseable {
      *
      * @hide
      */
-    @SystemApi
     @RequiresPermission(anyOf = {
             android.Manifest.permission.MANAGE_IPSEC_TUNNELS,
             android.Manifest.permission.PACKET_KEEPALIVE_OFFLOAD
@@ -477,7 +473,6 @@ public final class IpSecTransform implements AutoCloseable {
          * @throws IOException indicating other errors
          * @hide
          */
-        @SystemApi
         @NonNull
         @RequiresPermission(android.Manifest.permission.MANAGE_IPSEC_TUNNELS)
         public IpSecTransform buildTunnelModeTransform(