Fix crash from exceeding the number of permissible registered listeners

 - Do not register the new callback to TelephonyRegistry.

Flag: EXEMPT bugfix
fix: 363183211
Test: Manual test
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:a7927cc559c1c41b8d62036edc3ce534f9e2dd3d)
Merged-In: I20e6d4e35157d6e156a18e177ce071aa7d080e5d
Change-Id: I20e6d4e35157d6e156a18e177ce071aa7d080e5d