Merge "Add toString() to HardwareBuffer" into udc-qpr-dev am: 51bd996c66

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/native/+/23590120

Change-Id: Ife974db1695800dc4fbd2e8e51e92e89098db5c2
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>