The DU device has no DT bindings yet, instantiate it as a platform
device for now.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> Acked-by: Magnus Damm <damm@opensource.se>
[horms+renesas@verge.net.au: broken out of larger patch that
included board changes] Signed-off-by: Simon Horman <horms+renesas@verge.net.au>