Removed state machine from DcController

DcController state machine only has one state. Replaced the
state machine with a handler.

Fix: 74029073
Test: FrameworksTelephonyTests and manual tests
Merged-In: Ic34dcb171e711b6712637445ed7257631e87c5ab
Change-Id: Ic34dcb171e711b6712637445ed7257631e87c5ab
(cherry picked from commit 06247394)