Remove Preconditions usage to stop dependecy with non-updatble class

Stop depending on Preconditions that is not released on the same cadence
as the module, and is maintained as part of the framework.

Bug: 148636687
Test: atest TetheringTests NetworkStackNextTests

Change-Id: Id0dcec44f362f79bc8c046d722635687a7388aa2
3 files changed
tree: 1515d78a688786d33212fde528a510b72c156d38
  1. Tethering/