Merge "Clean up the lastUsedTime nullability" into udc-dev am: 9e1f5f9a am: 5a0ed67a am: fbb93031

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23078401



Change-Id: I83152e6be4aeaa568d820ebcd93e6dd2d250615c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>