devmode-test: add board param to cros_vm call

`--board` became required since crrev.com/c/2268282.

BUG=chromium:1100204
TEST=run devinstall_test.py locally

Change-Id: Ibe705f87a34620a3e413587c363491e014654055
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crostestutils/+/2270240
Tested-by: Shao-Chuan Lee <shaochuan@chromium.org>
Auto-Submit: Shao-Chuan Lee <shaochuan@chromium.org>
Reviewed-by: Tzung-Bi Shih <tzungbi@chromium.org>
Reviewed-by: Achuith Bhandarkar <achuith@chromium.org>
Reviewed-by: Dhanya Ganesh <dhanyaganesh@chromium.org>
Commit-Queue: Dhanya Ganesh <dhanyaganesh@chromium.org>
1 file changed