Merge "Print readable string in log for all events in CarrierConfigLoader" am: e1fd8db53b am: ec5fae9f7a

Original change: https://android-review.googlesource.com/c/platform/packages/services/Telephony/+/1670229

Change-Id: I0165e732a5ff705d3adde3e6a749320d86d8ae70