Update kernel to builds 8749440 am: dffd085174 am: 78ef605710 am: 1fe45d3fbb

Original change: https://android-review.googlesource.com/c/kernel/prebuilts/5.4/x86-64/+/2133148

Change-Id: I744754b34abb775430db8a8dc8b909d8fc133abb
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>