Add the import statements that got removed from TelecomServiceImpl

These got removed in this [CL](https://googleplex-android-review.git.corp.google.com/c/platform/packages/services/Telecomm/+/31143841), adding them back to due build failures in CP to BP1A.

Bug: 376259166
Flag: EXEMPT bugfix
Test: atest TelecomServiceImplTest
Change-Id: I1d6997e473c150b3f2ad35c039e833ebb3dcb887