DataConnection refactor updateSuspendState

Remove from getNetworkCapabilities() and update based on events instead.
Add event for CSS indicator changed to broadcast DataConnection state.

Test: atest ServiceStateTrackerTest, DataConnectionTest
Bug: 168529378
Change-Id: I39abe0bde114593c2a8cf19d27ae077815c42af3
Merged-In: I39abe0bde114593c2a8cf19d27ae077815c42af3