Merge "fastboot: copy AVB footer on boot image to end of partition" into rvc-dev am: 5062ea0564 am: 45314bf568

Original change: https://googleplex-android-review.googlesource.com/c/platform/system/core/+/11917941

Change-Id: I0bab0cc49ec03640d8434ba843e2d2d199d73408