Add Telecom debug menu.

New menu is accessible via *#*#828282#*#*.  This is a developer settings
type activity for the Telecom subsystem.
Adding in an option to enable the enhanced call blocking functionality
to facilitate testing.

Test: Manual
Bug: 28189985
Change-Id: If7ce957e3e04f8f3de2251bb70dafb6b5834a6d8