Skeleton for IVmTethering service with flag guarding

This reverts commit f9676878292a49caa03e5270c3be2769b029db60.

Bug: 340376953
Test: adb shell /apex/com.android.virt/bin/vm run-microdroid --network-supported

Change-Id: I9c859dd43e7ba7c852a71afce8f36ca10477ad24
diff --git a/virtualizationservice/aidl/Android.bp b/virtualizationservice/aidl/Android.bp
index fb89772..bca4512 100644
--- a/virtualizationservice/aidl/Android.bp
+++ b/virtualizationservice/aidl/Android.bp
@@ -86,6 +86,26 @@
 }
 
 aidl_interface {
+    name: "android.system.vmtethering",
+    srcs: ["android/system/vmtethering/**/*.aidl"],
+    unstable: true,
+    backend: {
+        java: {
+            sdk_version: "module_current",
+            apex_available: [
+                "com.android.virt",
+            ],
+        },
+        rust: {
+            enabled: true,
+            apex_available: [
+                "com.android.virt",
+            ],
+        },
+    },
+}
+
+aidl_interface {
     name: "android.system.virtualmachineservice",
     srcs: ["android/system/virtualmachineservice/**/*.aidl"],
     imports: [