[automerger skipped] Update kernel to builds 8840540 am: 946fd6220f -s ours

am skip reason: Merged-In Iafb8d65534b76b4ae09966528715d2ea2e6a6bf4 with SHA-1 0270554915 is already in history

Original change: https://android-review.googlesource.com/c/kernel/prebuilts/5.15/arm64/+/2222611

Change-Id: I188ebaf1f42b1faada628d6e7003d236c18f1059
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>