Add libnativehelper to hwasan-postsubmit

Test: Run tests under HWASan.
Bug: 193568145
Change-Id: I349dcde0755bdfc947dc4ea74f4a22740184ced6
diff --git a/tests/tests/libnativehelper/TEST_MAPPING b/tests/tests/libnativehelper/TEST_MAPPING
index f7789dc..9a86fff 100644
--- a/tests/tests/libnativehelper/TEST_MAPPING
+++ b/tests/tests/libnativehelper/TEST_MAPPING
@@ -3,5 +3,10 @@
     {
       "name": "CtsLibnativehelperTestCases"
     }
+  ],
+  "hwasan-postsubmit": [
+    {
+      "name": "CtsLibnativehelperTestCases"
+    }
   ]
 }