cros_unibuild_convert: move has-backlight to hardware-properties

This was moved in the schema, change this script to generate the right
content.

BUG=chromium:1115620
TEST=run for elm

Change-Id: Ib807cbceafe6145d31b783da65ae9336b4445d24
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/dev-util/+/2368199
Tested-by: Jack Rosenthal <jrosenth@chromium.org>
Auto-Submit: Jack Rosenthal <jrosenth@chromium.org>
Commit-Queue: Trent Begin <tbegin@chromium.org>
Reviewed-by: Trent Begin <tbegin@chromium.org>
1 file changed