Merge "fastboot: Fix flashing failure when a sparse image has an avb footer."...

Merge "fastboot: Fix flashing failure when a sparse image has an avb footer." into main am: ee4c9262 am: 2c23e604

Original change: https://android-review.googlesource.com/c/platform/system/core/+/2798383



Change-Id: I7e7f7251a8568a3996901194cdcd025aa63867fd
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>