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/TEST_MAPPING b/TEST_MAPPING
index 5a422df..72926ff 100644
--- a/TEST_MAPPING
+++ b/TEST_MAPPING
@@ -55,7 +55,7 @@
       "path": "packages/modules/Virtualization/encryptedstore"
     },
     {
-      "path": "packages/modules/Virtualization/virtualizationservice"
+      "path": "packages/modules/Virtualization/virtualizationmanager"
     },
     {
       "path": "packages/modules/Virtualization/libs/apexutil"