fix TetheringCoverageTests

Test: atest TetheringCoverageTests now passes, TreeHugger
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I0d83de14784f323400a83ce282cae1a3e7b4b396

Tethering/tests/integration/Android.bp

@@ -82,6 +82,7 @@ android_test {
         "libstaticjvmtiagent",
         // For NetworkStackUtils included in NetworkStackBase
         "libnetworkstackutilsjni",
+        "libtetherutilsjni",
     ],
     jarjar_rules: ":TetheringTestsJarJarRules",
     compile_multilib: "both",