Update kernel to builds 8640382 am: 8f3e439221

Original change: https://android-review.googlesource.com/c/kernel/prebuilts/4.19/arm64/+/2110585

Change-Id: Iff4796706e133e422ed6b74414d867a4b62245b2
Signed-off-by: Automerger Merge Worker <[email protected]>