Update kernel to builds 9643945 am: 588989c020 am: 8bdffbaa68 am: 7e76297528 am: 12d7426cf9 am: 9a58b07856

Original change: https://android-review.googlesource.com/c/kernel/prebuilts/4.19/arm64/+/2455306

Change-Id: Iebd996e415c091e2f8df849cf66d8427e0275089
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>