Notify VS when users or apps are removed

Register for the relevant broadcasts, and when we receive them pass
them on to VirtualizationService.

Bug: 294177871
Test: Manual; add/remove packages, users, see log messages
Change-Id: I154f620a04f8a1afa7c34baeb4ecf10a19374dd0
diff --git a/virtualizationservice/aidl/Android.bp b/virtualizationservice/aidl/Android.bp
index 66de092..112e1cc 100644
--- a/virtualizationservice/aidl/Android.bp
+++ b/virtualizationservice/aidl/Android.bp
@@ -61,6 +61,9 @@
     backend: {
         java: {
             sdk_version: "module_current",
+            apex_available: [
+                "com.android.virt",
+            ],
         },
         rust: {
             enabled: true,