rush: Add devicetree selection to FIT image

Use board ID to select 'nvidia,norrin' DT for Rush.

BUG=None
BRANCH=None
TEST=Built and booted on Rush, saw 'nvidia,norrin' selected and
kernel booted to command prompt OK.

Change-Id: Id7248df937648dab0ac52eddda9b83b2d942953a
Signed-off-by: Tom Warren <twarren@nvidia.com>
Reviewed-on: https://chromium-review.googlesource.com/217836
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
1 file changed