Update kernel to builds 8721220 am: d7dbb5f552 am: 1582cf15be

Original change: https://android-review.googlesource.com/c/kernel/prebuilts/5.15/arm64/+/2125556

Change-Id: I0393d43ff9bc143a8ed09544b72e3265e43e66c4
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>