Update kernel to builds 9643945 am: 588989c020

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

Change-Id: I28d4d94e23aeeb567f40ef7d8770f4216ee41fe3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>