Merge "cameraservice: Log session index" into udc-dev am: aa415dc2 am: f1413690 am: 33c6a21e

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



Change-Id: I2f4ec71a7b8bde2066aedb7201f3a11ac0eb4d5f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>