of: Add vendor prefix for Netron DY

Netron DY is a brand of LCD panels found on SBCs and tablets.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Thierry Reding <treding@nvidia.com>