Clear TelephonyManagerMap onStop

The change clears all telephony manager related maps onStop, in order for future callbacks/information to be registered properly.

Fix: 281529123
Test: manual reproduce and verify fix
Test: test task b/281884811
Test: included in daily validation test
Change-Id: Ie6e4ec7d5a03920dc07ff9e0300d3399181a602a