Add virtualization_maintenance_service

This is an AIDL service exposed by Virtualization Service to system
server (VirtualizationSystemService).

The implementation is Rust so no fuzzer is required.

I've put this behind the flag on general principle.

Bug: 294177871
Test: atest MicrodroidTests
Change-Id: Ia867fe27fb2e76d9688e4ba650ebf7b3f51ee597
diff --git a/private/service_contexts b/private/service_contexts
index 82af95e..3138d90 100644
--- a/private/service_contexts
+++ b/private/service_contexts
@@ -165,6 +165,9 @@
 is_flag_enabled(RELEASE_AVF_ENABLE_DEVICE_ASSIGNMENT, `
     android.system.virtualizationservice_internal.IVfioHandler u:object_r:vfio_handler_service:s0
 ')
+is_flag_enabled(RELEASE_AVF_ENABLE_LLPVM_CHANGES, `
+    android.system.virtualizationmaintenance u:object_r:virtualization_maintenance_service:s0
+')
 ambient_context                           u:object_r:ambient_context_service:s0
 app_binding                               u:object_r:app_binding_service:s0
 app_hibernation                           u:object_r:app_hibernation_service:s0