Update kernel to builds 8840540 am: 510d47b0bc am: 01b2a95404 am: 15718aee0b

Original change: https://googleplex-android-review.googlesource.com/c/kernel/prebuilts/5.15/x86-64/+/19320653

Change-Id: I8a723757db381f5accff805794f652a66dbc208e
Signed-off-by: Automerger Merge Worker <[email protected]>