Update kernel to builds 8732768 am: be77c320a6 am: bfb0c80101 am: 9a2599cec5

Original change: https://googleplex-android-review.googlesource.com/c/kernel/prebuilts/5.10/arm64/+/18919456

Change-Id: Ida38df6cc3258ab125ac042bd43fcccc13f632f4
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>