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

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



Change-Id: I474c1f3d1549abe62cd6f1c5c0cc8a710b471dd7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>