Add minijail to hwasan-postsubmit.

Change-Id: I0b21f30550a337d8a8ea4d4c6f52587a8b22351c
Test: Run tests under HWASan.
Bug: 193568145
diff --git a/TEST_MAPPING b/TEST_MAPPING
index bdded19..539379e 100644
--- a/TEST_MAPPING
+++ b/TEST_MAPPING
@@ -12,5 +12,19 @@
     {
       "name": "syscall_filter_unittest_gtest"
     }
+  ],
+  "hwasan-postsubmit": [
+    {
+      "name": "libminijail_unittest_gtest"
+    },
+    {
+      "name": "mj_system_unittest_gtest"
+    },
+    {
+      "name": "mj_util_unittest_gtest"
+    },
+    {
+      "name": "syscall_filter_unittest_gtest"
+    }
   ]
 }