of: Add vendor prefix for Nuvoton

Signed-off-by: Constantine Shulyupin <const@MakeLinux.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

Documentation/devicetree/bindings/vendor-prefixes.txt

@@ -146,6 +146,7 @@ netlogic	Broadcom Corporation (formerly NetLogic Microsystems)
 newhaven	Newhaven Display International
 nintendo	Nintendo
 nokia	Nokia
+nuvoton	Nuvoton Technology Corporation
 nvidia	NVIDIA
 nxp	NXP Semiconductors
 onnn	ON Semiconductor Corp.