dt-bindings: add exar to vendor prefixes list

Add Exar Corporation to vendors list.
Signed-off-by: Nandor Han <nandor.han@ge.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

Documentation/devicetree/bindings/vendor-prefixes.txt

@@ -102,6 +102,7 @@ ettus	NI Ettus Research
 eukrea  Eukréa Electromatique
 everest	Everest Semiconductor Co. Ltd.
 everspin	Everspin Technologies, Inc.
+exar	Exar Corporation
 excito	Excito
 ezchip	EZchip Semiconductor
 faraday	Faraday Technology Corporation