Use MDns aidl on NsdService

- Use MDns aidl to communicate with mdns service and register
  event listener to receive callback.
- Remove all NDC relevant code on NsdService.
- Use MDns aidl on NsdServiceTest.

Bug: 209894875
Test: atest FrameworksNetTests CtsNetTestCases
Change-Id: I65929dee3838fef753396e86c665abd66b6fec81
4 files changed