Add the resetIms interface between framework and ImsService.

Add the resetIms interface between framework and ImsService.

Bug: b/268251541
Test: atest ImsEnablementTrackerTest
Test:
1. AT&T activated, Fi deactivated
2. AT&T activated, Fi activated
3. AT&T deactivated, Fi activated
4. AT&T activated, Fi activated
5. repeat from step 1

Change-Id: I0574091723aab1f6ab7406ae851cd44c11616f3e