sign_virt_apex: add --do_not_validate_avb_version flag am: 9c4716a731 am: 65472a3f24

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Virtualization/+/2881587

Change-Id: I31cd8c534cef5a16d3cf5ee27fae8c8b3662c3a7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>