Remove NsdShim as it is not required

NsdShim is added to make the NsdManagerTest buildable in some old
branch. As a part of migrating to new branch, the nsdShim is not
needed anymore.

Test: atest CtsNetTestCases:android.net.cts.NsdManagerTest

Change-Id: Ie04fca274738d0d2262c2b801338c797894cb443
6 files changed