Fix ImsService Callback synchronization issues

ImsService was holding a lock when calling back
ImsService status. This could lead to a situation
where a call into ImsServiceController from the
platform and a call into the ImsServiceController
from the ImsService could cause a deadlock.

Bug: 74119196
Test: Manual

Change-Id: I9c58d7d5e2a8021cc1bfefc4ea08cb29ce8591e5