Replace @hide APIs in IpSecService

- Replace Slog with Log
- Replace Binder.withCleanCallingIdentity with
  BinderUtils.withCleanCallingIdentity

Bug: 204153604
Test: atest FrameworksNetTests CtsNetTestCases
Change-Id: I63083b3a4e50afe5154b4e8585d0eee46da819c6
1 file changed