scripts: Pass BOARD parameter to build_dlc

To be able to add licensing information to DLCs, the callers of
build_dlc have to provide the BOARD name.

BUG=chromium:911228
TEST=Create OS image before and after the change and verify
about_os_credits.html hasn't changed. Deploy dummy-dlc and verify a new
LICENSE file containning the license info is in
/run/imageloader/dummy-dlc/dummy-package/LICENSE.

Cq-Depend: chromium:2023772, chromium:2023857
Change-Id: I7c170db5bb2753415eecc8a1a380bf59cfbb276a
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosutils/+/2129955
Reviewed-by: Jae Hoon Kim <kimjae@chromium.org>
Reviewed-by: Alex Klein <saklein@chromium.org>
Reviewed-by: Amin Hassani <ahassani@chromium.org>
Commit-Queue: Andrew Lassalle <andrewlassalle@chromium.org>
Tested-by: Andrew Lassalle <andrewlassalle@chromium.org>
3 files changed