Add framework-connectivity-test-defaults

The defaults follow the same pattern as framework-wifi-test-defaults to
allow unit tests to build against hidden API in Connectivity.

Bug: 171540887
Test: m
Change-Id: I58bb6574f7e95053e4a95f76d1025506749ec2b8
diff --git a/tests/net/common/Android.bp b/tests/net/common/Android.bp
index babb81c..439665b 100644
--- a/tests/net/common/Android.bp
+++ b/tests/net/common/Android.bp
@@ -27,7 +27,11 @@
 
 java_library {
     name: "FrameworksNetCommonTests",
-    srcs: ["java/**/*.java", "java/**/*.kt"],
+    defaults: ["framework-connectivity-test-defaults"],
+    srcs: [
+        "java/**/*.java",
+        "java/**/*.kt",
+    ],
     static_libs: [
         "androidx.core_core",
         "androidx.test.rules",