Update kernel to builds 7489573 am: 0c0c0c9705 am: c9492439e3 am: f55a18e8af am: 2670fdfab1

Original change: https://googleplex-android-review.googlesource.com/c/kernel/prebuilts/5.4/arm64/+/15100470

Change-Id: Ibc1bea2b7a714d09079c7aa0f1419e21539389fd
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>