Add icing to hwasan-postsubmit

Test: Run tests under HWASan.
Bug: 193568145
Change-Id: I9962cc83c3e247d0030029122777b60492b93d25
diff --git a/TEST_MAPPING b/TEST_MAPPING
index 37cb5fc..8c51222 100644
--- a/TEST_MAPPING
+++ b/TEST_MAPPING
@@ -4,6 +4,11 @@
       "name": "IcingSearchEngineTest"
     }
   ],
+  "hwasan-postsubmit": [
+    {
+      "name": "IcingSearchEngineTest"
+    }
+  ],
   "imports": [
     {
       "path": "frameworks/base/apex/appsearch/service/java/com/android/server/appsearch"