Enabling tombstone transmit back to host

Test: Treehugger
Change-Id: Iedca1d0ae9f7082cd7b077cdc75d854a88edd247
diff --git a/TEST_MAPPING b/TEST_MAPPING
index 71249ba..b838ee9 100644
--- a/TEST_MAPPING
+++ b/TEST_MAPPING
@@ -1,4 +1,9 @@
 {
+  "postsubmit" : [
+    {
+      "name": "tombstone_transmit_tests"
+    }
+  ],
   "presubmit": [
     {
       "name": "circqueue_test",