Remove redundant notice property. am: 7bf45ef7d5 am: ef055fd982 am: d40f717f43

Original change: https://googleplex-android-review.googlesource.com/c/platform/external/exoplayer/+/19306164

Change-Id: I705d7201ccc2dd19c89ec887a1e0edfe7cae870b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>