Merge changes from topic "cherrypicker-L75200000955155814:N33400001274392636"

* changes:
  Update CallWaitingController, SYNC_IMS_ONLY
  Add EVENT_CARRIER_CONFIG_CHANGED to CallWaitingController
  Hangup CS waiting calls when call waiting is disabled
  Add dump to CallWaitingController
  Update CallWaitingController, SYNC_FIRST_CHANGE
  Update CallWaitingController, SYNC_FIRST_POWER_UP
  Update CallWaitingController, SYNC_USER_CHANGE
  Implement the terminal-based call waiting