Add CtsNetTestCasesLatestSdk to mainline-presubmit

This is the pilot run for mainline testing in Test Mapping Suite.

For supporting mainline testing in Test Mapping Suite, developers can
run tests by configuring the TEST_MAPPING file, the 3 simple steps are:
  - Add tests to be part of general-tests suite if the test does not
    depend on a device specific features.
  - Update test configureation for TradeFed to run mainline testing.
  - Update TEST_MAPPING file with test-group as "mainline-presubmit"

It's only for postsubmit now, and will be moved to actual presubmit
once the whole mechanism is stable.

For more details about the usage, please refer to go/test-mapping-mainline-user-guide

Bug: 160753366
Test: forrest.
Change-Id: I8704cc5626a3e049eb3c27adb86e9c1a4d828273
diff --git a/tests/cts/net/TEST_MAPPING b/tests/cts/net/TEST_MAPPING
index e2a9c75..3162e22 100644
--- a/tests/cts/net/TEST_MAPPING
+++ b/tests/cts/net/TEST_MAPPING
@@ -9,5 +9,15 @@
         }
       ]
     }
+  ],
+  "mainline-presubmit": [
+    {
+      "name": "CtsNetTestCasesLatestSdk[CaptivePortalLoginGoogle.apk+NetworkStackGoogle.apk]",
+      "options": [
+        {
+          "exclude-annotation": "com.android.testutils.SkipPresubmit"
+        }
+      ]
+    }
   ]
 }