of: Add Okaya Electric America vendor prefix

This patch adds vendor prefix for Okaya Electronic America, a provider
of LCD modules and display technologies.
Signed-off-by: Gary Bisson <gary.bisson@boundarydevices.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Thierry Reding <treding@nvidia.com>

Documentation/devicetree/bindings/vendor-prefixes.txt

@@ -148,6 +148,7 @@ nintendo	Nintendo
 nokia	Nokia
 nvidia	NVIDIA
 nxp	NXP Semiconductors
+okaya	Okaya Electric America, Inc.
 onnn	ON Semiconductor Corp.
 opencores	OpenCores.org
 ortustech	Ortus Technology Co., Ltd.