Move virtmgr files to their own directory

Create virtualizationmanager/ folder, move the corresponding files into
it and create build rules.

We also remove now unused dependencies of virtualizationservice.

Bug: 245727626
Test: atest -p packages/modules/Virtualization:avf-presubmit
Change-Id: If33e88bdcdac89e1d451589463ce21e11d6aafc8
diff --git a/virtualizationmanager/TEST_MAPPING b/virtualizationmanager/TEST_MAPPING
new file mode 100644
index 0000000..a680f6d
--- /dev/null
+++ b/virtualizationmanager/TEST_MAPPING
@@ -0,0 +1,7 @@
+{
+  "avf-presubmit": [
+    {
+      "name": "virtualizationmanager_device_test"
+    }
+  ]
+}