Update kernel to builds 7518296 am: b8a97f1e6b am: 74878bdcff am: 41d7726cdc am: af1974371e am: 993ba096cc

Original change: https://googleplex-android-review.googlesource.com/c/kernel/prebuilts/common-modules/virtual-device/5.4/x86-64/+/15218136

Change-Id: I78ed1b0102ef925cdd48f860291d8618649f2ff0
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>