Update kernel to builds 8721220 am: d7dbb5f552

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

Change-Id: I080ae0c51ed8d24d317b55faf27fbc7011e2cd43
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>