Merge "Print readable string in log for all events in CarrierConfigLoader" am: e1fd8db53b am: ec5fae9f7a am: 3f2b7ef25b

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

Change-Id: Ia7d1eef5487380a2427dc3a48a6faf3c8da2e2a4