Support multiple DcTracker for IWLAN refactoring

If the device is configured as AP-assited mode, multiple
DcTrackers will be created for each corresponding
data service. For legacy mode, only one DcTracker will
be created.

Test: Unit tests and telephony sanity tests
Bug: 73659459
Merged-In: I320e9b75dbec1725b5d69e482735a01cae5795b6
Change-Id: I320e9b75dbec1725b5d69e482735a01cae5795b6
(cherry picked from commit 79505d27)