aosp_arm64: update kernel prebuilt am: 54debc50 am: 3a4869ed am: a582af9c am: 43a8ade7 am: 7956002f Original change: https://googleplex-android-review.googlesource.com/c/kernel/prebuilts/4.19/arm64/+/12037058 Change-Id: I70c328e47b1468a097ecdbe2d2589479ac9212ed