of: Add vendor prefix for Nordic Semiconductor

Nordic Semiconductor is a semiconductor company specializing in ARM
Cortex-M based SoCs for low-power wireless communication, especially
Bluetooth.
Signed-off-by: NKumar Gala <kumar.gala@linaro.org>
Signed-off-by: NRob Herring <robh@kernel.org>

Documentation/devicetree/bindings/vendor-prefixes.txt

@@ -213,6 +213,7 @@ newhaven	Newhaven Display International
 ni	National Instruments
 nintendo	Nintendo
 nokia	Nokia
+nordic	Nordic Semiconductor
 nuvoton	Nuvoton Technology Corporation
 nvd	New Vision Display
 nvidia	NVIDIA