Add CtsNetTestCases and CtsNativeNetDnsTestCases to MTS.

Test: m mts, mts-tradefed run mts-dns-resolver
Bug: 139554892
Bug: 123411735
Change-Id: I789eaa095079a52a5aee5cee177203c68ec8040b
diff --git a/tests/cts/net/Android.bp b/tests/cts/net/Android.bp
index b6ea4af..b00455d 100644
--- a/tests/cts/net/Android.bp
+++ b/tests/cts/net/Android.bp
@@ -60,6 +60,7 @@
         "cts",
         "vts",
         "general-tests",
+        "mts",
     ],
 
 }