Cleaned up data enable code

Moved some data enabled logic into carrier action agent. Also
do not notify data connection state when user enable/dsiable data.
The data connection states will be notified when the data connection
state actually changed.

Test: Unit tests
Bug: 73659459
Change-Id: Ie137bd9b438d75c2e566ba6259fa14060f93c92a
2 files changed