factory_verify: Support secure_erase_nvme.

TEST=Run 'factory_reset.sh /dev/nvme0n1p9 secure' and check formatting success.
BUG=chromium:700436

Change-Id: I9ae7c63171a3320260ab6dbdf7568e64af192890
Reviewed-on: https://chromium-review.googlesource.com/557482
Commit-Ready: Yilun Lin <yllin@chromium.org>
Tested-by: Yilun Lin <yllin@chromium.org>
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-by: Gwendal Grignou <gwendal@chromium.org>
2 files changed