Update kernel to builds 8732768 am: be77c320a6 am: bfb0c80101 am: 971aed29dd am: 28d840d8f3

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

Change-Id: I734f8398e490b050a9ce1b2b911abfb7b8d20c7a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>