base_image_util.sh: Call --factory-install on DLC images

In order to support factory installing DLC images into base image
unencrypted stateful partition.

BUG=b:166782419
TEST=w/ CQ depends

Cq-Depend: chromium:3192145
Change-Id: I09195985e5137ab44312a5b74ae1a62e6a311404
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosutils/+/3192146
Tested-by: Jae Hoon Kim <kimjae@chromium.org>
Reviewed-by: Vyshu Khota <vyshu@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Jae Hoon Kim <kimjae@chromium.org>
1 file changed