Switch mkenvimage to new one supported by cf team am: 3b031a6b4d am: 6bf9ca5353

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Virtualization/+/2055367

Change-Id: I9dd672d2ea984ab911a735dedb62d73d85c58e84
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>