Merge "cameraservice: Log session index" into udc-dev am: aa415dc2 am: 51e8a49b am: b3cbe5c4

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/av/+/22984740



Change-Id: I80bbb336a7f7caf6ab6ded8da5c4588d2462ee22
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>