Update kernel to builds 7505743 am: ec9713feff am: a077c23963 am: 6adef4a033

Original change: https://googleplex-android-review.googlesource.com/c/kernel/prebuilts/5.4/arm64/+/15151594

Change-Id: I860ae55f144e5371f4b44cf509fc6b35b8c7298d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>