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

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

Change-Id: I0f7e2e4c6ff960590a65b78beb06d64a817bcd0b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>