Revert^2 "Introducing vm_tethering_service as system_server_service"

This reverts commit 3833f2f9d62c69cbc95053703b769c515d970b94.

Reason for revert: Relanding the change

Change-Id: I0089cb05124f20f9bb735aa99f753c8bc658dde7
diff --git a/private/service_contexts b/private/service_contexts
index c7917f1..d1eecd5 100644
--- a/private/service_contexts
+++ b/private/service_contexts
@@ -172,6 +172,7 @@
 ')
 is_flag_enabled(RELEASE_AVF_ENABLE_NETWORK, `
     android.system.virtualizationservice_internal.IVmnic u:object_r:vmnic_service:s0
+    android.system.vmtethering.IVmTethering              u:object_r:vm_tethering_service:s0
 ')
 ambient_context                           u:object_r:ambient_context_service:s0
 app_binding                               u:object_r:app_binding_service:s0