tests: add vboot avb test cases BUG=b:399608548 TEST='USE_AVB=1 make runtests' BRANCH=main Change-Id: Ifc1970be74fcf7aa2ef9b1d19039a20ace766fa5 Signed-off-by: Grzegorz Bernacki <bernacki@google.com> Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/7280342 Reviewed-by: Yu-Ping Wu <yupingso@chromium.org>