tests: add test cases for booting OTA recovery partition BUG=b:454547338 BRANCH=none TEST='USE_AVB=1 make runtests' Change-Id: I168b980bdf8b4e1038cf312e8cf0aff313976b20 Signed-off-by: Grzegorz Bernacki <bernacki@google.com> Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/7535103 Commit-Queue: ChromeOS Auto Retry <chromeos-auto-retry@chromeos-bot.iam.gserviceaccount.com> Reviewed-by: Yu-Ping Wu <yupingso@chromium.org>