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.te b/private/service.te
index 36d6ccf..c4e7cbc 100644
--- a/private/service.te
+++ b/private/service.te
@@ -26,6 +26,9 @@
 is_flag_enabled(RELEASE_AVF_ENABLE_DEVICE_ASSIGNMENT, `
     type vfio_handler_service,          service_manager_type;
 ')
+is_flag_enabled(RELEASE_AVF_ENABLE_LLPVM_CHANGES, `
+    type virtualization_maintenance_service, service_manager_type;
+')
 
 type uce_service,                   service_manager_type;
 type wearable_sensing_service,      app_api_service, system_server_service, service_manager_type;