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/virtualizationservice.te b/private/virtualizationservice.te
index 3d0aac0..b6ba55b 100644
--- a/private/virtualizationservice.te
+++ b/private/virtualizationservice.te
@@ -28,6 +28,7 @@
     # Let virtualizationservice find and communicate with vmnic.
     allow virtualizationservice vmnic_service:service_manager find;
     binder_call(virtualizationservice, vmnic)
+    allow virtualizationservice vm_tethering_service:service_manager find;
 ')
 
 # Allow the virtualizationservice domain to serve a remotely provisioned component for