Using internet data connection is DORMANT to reflect ENDC Idle state

Some Carriers define the 5G icon's Idle state in ENDC LTE is no
internet data connection. Adding the way for it.

Bug: 193848289
Test: build pass.
atest DcControllerTest (pass)
atest NetworkTypeControllerTest (pass)
atest DcTrackerTest (pass)

Change-Id: Ia30fa140e5d4a2d0263bad1b8d92c5a133f4901e