Resolve Telecom UserManager/UserInfo references

As part of telecom mainline prep, ensure that the references to hidden
APIs in UserManager and UserInfo are resolved.

Bug: 308024293
Bug: 311773409
Test: atest TelecomUnitTests
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:92991c93f966fca29ac450fc24c4ffd94068b3bb)
Merged-In: I488b7d10cea083d405c9f6bd2890fe782790e720
Change-Id: I488b7d10cea083d405c9f6bd2890fe782790e720