Update TEST_MAPPING files

Some of the rust_tests were not part of either avf-presubmit or
avf-postsubmit. This change puts them into avf-presubmit

Test: atest --test-mapping packages/modules/Virtualization:avf-presubmit
Change-Id: Iac0cd0efeb08eee15eeb8dd1bd621d705ca24248
diff --git a/microdroid_manager/TEST_MAPPING b/microdroid_manager/TEST_MAPPING
new file mode 100644
index 0000000..af0abe7
--- /dev/null
+++ b/microdroid_manager/TEST_MAPPING
@@ -0,0 +1,7 @@
+{
+  "avf-presubmit" : [
+    {
+      "name" : "microdroid_manager_test"
+    }
+  ]
+}