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>

Documentation/devicetree/bindings/vendor-prefixes.txt

@@ -196,6 +196,7 @@ nec	NEC LCD Technologies, Ltd.
 neonode		Neonode Inc.
 netgear	NETGEAR
 netlogic	Broadcom Corporation (formerly NetLogic Microsystems)
+netron-dy	Netron DY
 netxeon		Shenzhen Netxeon Technology CO., LTD
 nexbox	Nexbox
 newhaven	Newhaven Display International