Automatically add FEATURE_IPSEC_TUNNEL_MIGRATION for U/U+ devices.

This change automatically enables the IPSEC_TUNNEL_MIGRATION
feature if the VSR API level is greater than T

This is for OEM convenience to ensure that they do not have to add the
feature for each device that they ship.

Bug: 169169973
Test: Removed feature from device, CTS tested on sunfish that
      the feature does not exist
Change-Id: I4ddaa8803be6e9738a2bd0af6793720571b67ff2

core/java/com/android/server/SystemConfig.java

@@ -1521,6 +1521,8 @@ public class SystemConfig {
             addFeature(PackageManager.FEATURE_IPSEC_TUNNELS, 0);
         }
 
+        enableIpSecTunnelMigrationOnVsrUAndAbove();
+
         if (isErofsSupported()) {
             if (isKernelVersionAtLeast(5, 10)) {
                 addFeature(PackageManager.FEATURE_EROFS, 0);
@@ -1534,6 +1536,18 @@ public class SystemConfig {
         }
     }
 
+    // This method only enables a new Android feature added in U and will not have impact on app
+    // compatibility
+    @SuppressWarnings("AndroidFrameworkCompatChange")
+    private void enableIpSecTunnelMigrationOnVsrUAndAbove() {
+        final int vsrApi =
+                SystemProperties.getInt(
+                        "ro.vendor.api_level", Build.VERSION.DEVICE_INITIAL_SDK_INT);
+        if (vsrApi > Build.VERSION_CODES.TIRAMISU) {
+            addFeature(PackageManager.FEATURE_IPSEC_TUNNEL_MIGRATION, 0);
+        }
+    }
+
     private void addFeature(String name, int version) {
         FeatureInfo fi = mAvailableFeatures.get(name);
         if (fi == null) {