Merge "Revert "Add last_known_rat field to VoiceCallSession"" into tm-qpr-dev am: 7c27f6e33c am: 51708e587d

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/proto_logging/+/20171707

Change-Id: I8f9f9a04e3f6736be11766f848c6dec81ba0e0a7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
tree: 339c1d8e9e940fff003cd861c4b67c3a298b0857
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