Update kernel to builds 8732768 am: 645de1265d am: b68abcb5fe am: 2b77488bfd

Original change: https://googleplex-android-review.googlesource.com/c/kernel/prebuilts/common-modules/virtual-device/5.10/arm64/+/18964390

Change-Id: I64b76767bbe93f67d9d4f8c8b2df21611b35959f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>