[CS10]Remove the hidden API usage of BitUtils

The connection service will become the main line module.
It is difficult to include BitUtils in the module. and so
Move the hidden API needed in BitUtils to NetworkCapabilitiesUtils.

Bug: 170598012
Test: atest ConnectivityServiceTest
      atest NetworkCapabilitiesTest
      atest DnsUtilsTest
Change-Id: Ibc81827e25a54fc3ff94f78d810fe4f5073e3a98