Remove AVB footer & chained vbmeta image from the loaded boot image am: 543bd94bf0 am: 9823a6530a am: 60dd526e20 am: d80c425051

Original change: https://android-review.googlesource.com/c/platform/test/vts-testcase/security/+/1953492

Change-Id: I99c982d6be60c4c27da8004b4af80313018a3e64