Fix broken javadoc for timeshiftmode am: d21f211d

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/21922606



Change-Id: Icc9a9ca54b8288cef9719f4ef1b9c7b758f1349a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>