Don't wait for onDied

On Cuttlefish, crash of the crosvm process immediately closes all adb
connections (b/195765441). As a reuslt, onDied is called "after" the
connection is lost and the host thinks that the test has failed to
complete.

Work around this issue by finishing the test proactively when stop() is
called on a virtual machine, without waiting for the onDied callback.

Also moving the test to presubmit.

Bug: 195765441
Bug: 203483081
Test: atest MicrodroidTestApp
Change-Id: I4f7b28f2bc9ccedddee1d5e5e3e81d2672860372
diff --git a/TEST_MAPPING b/TEST_MAPPING
index 69f5518..b07dc3b 100644
--- a/TEST_MAPPING
+++ b/TEST_MAPPING
@@ -8,9 +8,7 @@
     },
     {
       "name": "VirtualizationTestCases"
-    }
-  ],
-  "postsubmit": [
+    },
     {
       "name": "MicrodroidTestApp"
     }