Add FrameworksNetIntegrationTests to postsubmit

After checking flake metrics for this test, it can be added in
presubmit.

Test: this change is to check results in postsubmit
Change-Id: I70cb149629a3e959e29cfd21048e7b148bd29fe9
diff --git a/tests/net/integration/Android.bp b/tests/net/integration/Android.bp
index 7d9b7b7..874bd4b 100644
--- a/tests/net/integration/Android.bp
+++ b/tests/net/integration/Android.bp
@@ -36,6 +36,7 @@
         "services.net",
         "testables",
     ],
+    test_suites: ["device-tests"],
     use_embedded_native_libs: true,
     jni_libs: [
         // For mockito extended