[TL02]Remove hidden API usage of NetworkAgent

The connection service will become the mainline module.
Remove the hidden API usage of NetworkAgent.

Bug: 170598012
CTS-Coverage-Bug: 170598012
Test: atest FrameworksNetTests FrameworksTelephonyTests
      atest FrameworksWifiTests
Change-Id: I4e4040ae7f94bdf479c7df9ec2ffabafbe06331c
6 files changed
tree: 1dd1cee0f5d4f25b38939bdd9687a6886d0ecc02
  1. framework/
  2. service/
  3. services/
  4. tests/
  5. OWNERS