Merge "cameraservice: Log session index" into udc-dev am: 8313fab9

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23001482



Change-Id: I321946fd846d0601b559b75f893a6b10a3b455ab
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>