telephony-stack util API lib

attach copyable hidden util API classes to create a jar
file containing these, and statically link it from
telephony mainline modules. Need to jarjar those classes
otherwise classloader will load classes with the same
name in boot class path(framework.jar)

Bug: 137202333
Test: Manual & Build
Change-Id: Ibeca143f472d46b9ebd545d04bb6b8bae984cfbc