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/Android.bp b/Android.bp
index 3b6b8b5..b2af69e 100644
--- a/Android.bp
+++ b/Android.bp
@@ -77,6 +77,7 @@
     config_namespace: "ANDROID",
     bool_variables: [
         "release_avf_enable_dice_changes",
+        "release_avf_enable_network",
         "release_avf_enable_vendor_modules",
         "release_avf_enable_virt_cpufreq",
     ],
@@ -91,6 +92,9 @@
         release_avf_enable_dice_changes: {
             cflags: ["-DAVF_OPEN_DICE_CHANGES=1"],
         },
+        release_avf_enable_network: {
+            cflags: ["-DAVF_ENABLE_NETWORK=1"],
+        },
         release_avf_enable_vendor_modules: {
             cflags: ["-DAVF_ENABLE_VENDOR_MODULES=1"],
         },