Merge "Attempt to unlink session file if hardlink fails" into udc-dev am: 7fbed032

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22959449



Change-Id: I8c0b63b8aa1eaf14ca29de63b5ea338092e65c48
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>