[Virt javalib testapi] Feature flag LLPVM_CHANGES

Introduce FEATURE_LLPVM_CHANGES which corresponds to build time flag
llpvm_changes. This is populated by calling the rust aidl backend using
IVirtualizationService.isFeatureEnabled(_)

Test: Builds
Bug: 291213394
Change-Id: I082cc6d95bc5ac3083e14f96548d8fbecd74418f
diff --git a/javalib/api/test-current.txt b/javalib/api/test-current.txt
index 0a988d8..8255104 100644
--- a/javalib/api/test-current.txt
+++ b/javalib/api/test-current.txt
@@ -26,6 +26,7 @@
     method @FlaggedApi("com.android.system.virtualmachine.flags.avf_v_test_apis") @NonNull public java.util.List<java.lang.String> getSupportedOSList() throws android.system.virtualmachine.VirtualMachineException;
     method @FlaggedApi("com.android.system.virtualmachine.flags.avf_v_test_apis") @RequiresPermission(android.system.virtualmachine.VirtualMachine.MANAGE_VIRTUAL_MACHINE_PERMISSION) public boolean isFeatureEnabled(String) throws android.system.virtualmachine.VirtualMachineException;
     field @FlaggedApi("com.android.system.virtualmachine.flags.avf_v_test_apis") public static final String FEATURE_DICE_CHANGES = "com.android.kvm.DICE_CHANGES";
+    field @FlaggedApi("com.android.system.virtualmachine.flags.avf_v_test_apis") public static final String FEATURE_LLPVM_CHANGES = "com.android.kvm.LLPVM_CHANGES";
     field @FlaggedApi("com.android.system.virtualmachine.flags.avf_v_test_apis") public static final String FEATURE_MULTI_TENANT = "com.android.kvm.MULTI_TENANT";
     field @FlaggedApi("com.android.system.virtualmachine.flags.avf_v_test_apis") public static final String FEATURE_REMOTE_ATTESTATION = "com.android.kvm.REMOTE_ATTESTATION";
     field @FlaggedApi("com.android.system.virtualmachine.flags.avf_v_test_apis") public static final String FEATURE_VENDOR_MODULES = "com.android.kvm.VENDOR_MODULES";