Update kernel to builds 7624876 am: 75d5d6d0df am: 6a75c4a934

Original change: https://googleplex-android-review.googlesource.com/c/kernel/prebuilts/4.19/arm64/+/15530357

Change-Id: If436cf2692e8e6c60bc197a47a201e1d31bda1da