Update kernel to builds 9084628 am: b378f647a5

Original change: https://android-review.googlesource.com/c/kernel/prebuilts/4.19/arm64/+/2222072

Change-Id: Ibc64b0b3f71fe126d3aae02c3c62ef5589c159b5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>