Make the CTS tests explicitly depend on modules-utils-build.

In AOSP master and downstream branches, this likely works via a
transitive dependency. In mainline-prod, this doesn't work. Add
the dependency explicitly, since it makes things build everywhere
and in general it's also good practice to "include what you use".

Bug: 167645754
Test: m CtsNetTestCasesLatestSdk in mainline-prod has fewer errors
Change-Id: Ie575372415a806deee9996aab7f920d2c15bff80

tests/cts/net/Android.bp

@@ -48,6 +48,7 @@ java_defaults {
         "ctstestrunner-axt",
         "junit",
         "junit-params",
+        "modules-utils-build",
         "net-utils-framework-common",
         "truth-prebuilt",
     ],