Centralize nsd associated files

Move all nsd associated files include framework, service and test
to package/Nsd first. After clear all hidden API dependencies, we
can easily migrate these files into connectivity mainline module.

Bug: 206893064
Test: atest FrameworksNetTests CtsNetTestCases
Change-Id: Id26f471a10fe7882e31ccc2dbb73219461f00dbd
diff --git a/Android.bp b/Android.bp
index 5851f43..f8a9e0f 100644
--- a/Android.bp
+++ b/Android.bp
@@ -69,6 +69,7 @@
         // Java/AIDL sources under frameworks/base
         ":framework-annotations",
         ":framework-blobstore-sources",
+        ":framework-connectivity-nsd-sources",
         ":framework-core-sources",
         ":framework-drm-sources",
         ":framework-graphics-nonupdatable-sources",