Update kernel to builds 7489573 am: 0c0c0c9705 am: c9492439e3

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

Change-Id: I84053310a9a9d28c4ff7eb5573901f28bf80f06d