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

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

Change-Id: I9b04d3859658c4d920763bf5492bcdaf0697a864
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>