services.net-module-wifi: Add TEST_MAPPING

services.net-module-wifi is a dependency of the Wifi module.
Run Wifi tests in presubmit to ensure changes here don't
break Wifi.

Bug: 183902758
Test: presubmit
Change-Id: I57fbe925d7ad1a1df49740f0de340c88eba495e8
diff --git a/services/net/TEST_MAPPING b/services/net/TEST_MAPPING
index 7025dd1..7eca1f9 100644
--- a/services/net/TEST_MAPPING
+++ b/services/net/TEST_MAPPING
@@ -2,6 +2,9 @@
   "imports": [
     {
       "path": "frameworks/base/core/java/android/net"
+    },
+    {
+      "path": "packages/modules/Wifi/framework"
     }
   ]
-}
\ No newline at end of file
+}