Update kernel to builds 9084628 am: b378f647a5 am: dfd0bcecbf am: 4a1b86058e am: d8e842fde6

Original change: https://android-review.googlesource.com/c/kernel/prebuilts/4.19/arm64/+/2222072

Change-Id: I645105a16d1ac6361a027ac7ad9140762aeaf479
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>