Update kernel to builds 7273670 am: 81bddc1536 am: ca44920895 am: 29534c5aae

Original change: https://android-review.googlesource.com/c/kernel/prebuilts/5.4/arm64/+/1671808

Change-Id: Ib5681e24acf68a5fa92119f3c7ff6be6074a5082