Remove redundant notice property. am: 46d7b5a059 am: 52dcf3c62a

Original change: https://android-review.googlesource.com/c/platform/external/exoplayer/+/2154455

Change-Id: Ieb6abc935a785821b3c94e4e762d60b8730ba5d1
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>