Revert "Revert "Listen for SimultaneousCallingTracker updates in..."

Revert submission 26317647-revert-25956237-simultaneous-calling-tracker-YHCVTCWNNX

Reason for revert: We have identified and resolved the root issue. Fix will megre with this revert^2 as part of ag/26333990

Reverted changes: /q/submissionid:26317647-revert-25956237-simultaneous-calling-tracker-YHCVTCWNNX

Change-Id: I713b32106b5680010450ee18e7dffe37f6473ac4
1 file changed