cros-ec: Send a start message after the stay-in-ro
cros-ec: Send a start message after the stay-in-ro

The extra command (stay-in-ro) consumes the start message, so we
need to issue another one before write firmware.

hughsie/fwupd,hughsie/fwupd,fwupd/fwupd,hughsie/fwupd,fwupd/fwupd,fwupd/fwupd,hughsie/fwupd,fwupd/fwupd