Update kernel to builds 8747247 am: a60cfd505d

Original change: https://googleplex-android-review.googlesource.com/c/kernel/prebuilts/5.15/x86-64/+/19009986

Change-Id: Ibe5917e5e8322d0f9b9c3e8ac226c3cf5432af99
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>